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![René Scharfe](/assets/img/avatar_default.png)
Apply the semantic patch swap.cocci to convert hand-rolled swaps to use the macro SWAP. The resulting code is shorter and easier to read, the object code is effectively unchanged. The patch for object.c had to be hand-edited in order to preserve the comment before the change; Coccinelle tried to eat it for some reason. Signed-off-by: Rene Scharfe <l.s.r@web.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
586 lines
19 KiB
C
586 lines
19 KiB
C
#ifndef STRBUF_H
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#define STRBUF_H
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/**
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* strbuf's are meant to be used with all the usual C string and memory
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* APIs. Given that the length of the buffer is known, it's often better to
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* use the mem* functions than a str* one (memchr vs. strchr e.g.).
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* Though, one has to be careful about the fact that str* functions often
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* stop on NULs and that strbufs may have embedded NULs.
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*
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* A strbuf is NUL terminated for convenience, but no function in the
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* strbuf API actually relies on the string being free of NULs.
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*
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* strbufs have some invariants that are very important to keep in mind:
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*
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* - The `buf` member is never NULL, so it can be used in any usual C
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* string operations safely. strbuf's _have_ to be initialized either by
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* `strbuf_init()` or by `= STRBUF_INIT` before the invariants, though.
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*
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* Do *not* assume anything on what `buf` really is (e.g. if it is
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* allocated memory or not), use `strbuf_detach()` to unwrap a memory
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* buffer from its strbuf shell in a safe way. That is the sole supported
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* way. This will give you a malloced buffer that you can later `free()`.
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*
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* However, it is totally safe to modify anything in the string pointed by
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* the `buf` member, between the indices `0` and `len-1` (inclusive).
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*
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* - The `buf` member is a byte array that has at least `len + 1` bytes
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* allocated. The extra byte is used to store a `'\0'`, allowing the
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* `buf` member to be a valid C-string. Every strbuf function ensure this
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* invariant is preserved.
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*
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* NOTE: It is OK to "play" with the buffer directly if you work it this
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* way:
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*
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* strbuf_grow(sb, SOME_SIZE); <1>
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* strbuf_setlen(sb, sb->len + SOME_OTHER_SIZE);
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*
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* <1> Here, the memory array starting at `sb->buf`, and of length
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* `strbuf_avail(sb)` is all yours, and you can be sure that
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* `strbuf_avail(sb)` is at least `SOME_SIZE`.
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*
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* NOTE: `SOME_OTHER_SIZE` must be smaller or equal to `strbuf_avail(sb)`.
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*
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* Doing so is safe, though if it has to be done in many places, adding the
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* missing API to the strbuf module is the way to go.
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*
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* WARNING: Do _not_ assume that the area that is yours is of size `alloc
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* - 1` even if it's true in the current implementation. Alloc is somehow a
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* "private" member that should not be messed with. Use `strbuf_avail()`
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* instead.
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*/
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/**
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* Data Structures
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* ---------------
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*/
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/**
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* This is the string buffer structure. The `len` member can be used to
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* determine the current length of the string, and `buf` member provides
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* access to the string itself.
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*/
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struct strbuf {
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size_t alloc;
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size_t len;
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char *buf;
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};
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extern char strbuf_slopbuf[];
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#define STRBUF_INIT { 0, 0, strbuf_slopbuf }
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/**
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* Life Cycle Functions
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* --------------------
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*/
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/**
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* Initialize the structure. The second parameter can be zero or a bigger
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* number to allocate memory, in case you want to prevent further reallocs.
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*/
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extern void strbuf_init(struct strbuf *, size_t);
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/**
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* Release a string buffer and the memory it used. You should not use the
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* string buffer after using this function, unless you initialize it again.
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*/
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extern void strbuf_release(struct strbuf *);
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/**
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* Detach the string from the strbuf and returns it; you now own the
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* storage the string occupies and it is your responsibility from then on
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* to release it with `free(3)` when you are done with it.
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*/
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extern char *strbuf_detach(struct strbuf *, size_t *);
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/**
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* Attach a string to a buffer. You should specify the string to attach,
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* the current length of the string and the amount of allocated memory.
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* The amount must be larger than the string length, because the string you
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* pass is supposed to be a NUL-terminated string. This string _must_ be
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* malloc()ed, and after attaching, the pointer cannot be relied upon
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* anymore, and neither be free()d directly.
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*/
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extern void strbuf_attach(struct strbuf *, void *, size_t, size_t);
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/**
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* Swap the contents of two string buffers.
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*/
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static inline void strbuf_swap(struct strbuf *a, struct strbuf *b)
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{
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SWAP(*a, *b);
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}
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/**
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* Functions related to the size of the buffer
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* -------------------------------------------
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*/
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/**
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* Determine the amount of allocated but unused memory.
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*/
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static inline size_t strbuf_avail(const struct strbuf *sb)
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{
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return sb->alloc ? sb->alloc - sb->len - 1 : 0;
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}
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/**
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* Ensure that at least this amount of unused memory is available after
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* `len`. This is used when you know a typical size for what you will add
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* and want to avoid repetitive automatic resizing of the underlying buffer.
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* This is never a needed operation, but can be critical for performance in
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* some cases.
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*/
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extern void strbuf_grow(struct strbuf *, size_t);
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/**
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* Set the length of the buffer to a given value. This function does *not*
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* allocate new memory, so you should not perform a `strbuf_setlen()` to a
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* length that is larger than `len + strbuf_avail()`. `strbuf_setlen()` is
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* just meant as a 'please fix invariants from this strbuf I just messed
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* with'.
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*/
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static inline void strbuf_setlen(struct strbuf *sb, size_t len)
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{
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if (len > (sb->alloc ? sb->alloc - 1 : 0))
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die("BUG: strbuf_setlen() beyond buffer");
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sb->len = len;
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sb->buf[len] = '\0';
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}
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/**
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* Empty the buffer by setting the size of it to zero.
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*/
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#define strbuf_reset(sb) strbuf_setlen(sb, 0)
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/**
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* Functions related to the contents of the buffer
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* -----------------------------------------------
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*/
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/**
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* Strip whitespace from the beginning (`ltrim`), end (`rtrim`), or both side
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* (`trim`) of a string.
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*/
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extern void strbuf_trim(struct strbuf *);
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extern void strbuf_rtrim(struct strbuf *);
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extern void strbuf_ltrim(struct strbuf *);
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/**
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* Replace the contents of the strbuf with a reencoded form. Returns -1
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* on error, 0 on success.
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*/
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extern int strbuf_reencode(struct strbuf *sb, const char *from, const char *to);
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/**
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* Lowercase each character in the buffer using `tolower`.
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*/
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extern void strbuf_tolower(struct strbuf *sb);
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/**
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* Compare two buffers. Returns an integer less than, equal to, or greater
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* than zero if the first buffer is found, respectively, to be less than,
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* to match, or be greater than the second buffer.
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*/
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extern int strbuf_cmp(const struct strbuf *, const struct strbuf *);
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/**
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* Adding data to the buffer
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* -------------------------
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*
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* NOTE: All of the functions in this section will grow the buffer as
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* necessary. If they fail for some reason other than memory shortage and the
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* buffer hadn't been allocated before (i.e. the `struct strbuf` was set to
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* `STRBUF_INIT`), then they will free() it.
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*/
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/**
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* Add a single character to the buffer.
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*/
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static inline void strbuf_addch(struct strbuf *sb, int c)
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{
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if (!strbuf_avail(sb))
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strbuf_grow(sb, 1);
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sb->buf[sb->len++] = c;
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sb->buf[sb->len] = '\0';
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}
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/**
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* Add a character the specified number of times to the buffer.
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*/
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extern void strbuf_addchars(struct strbuf *sb, int c, size_t n);
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/**
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* Insert data to the given position of the buffer. The remaining contents
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* will be shifted, not overwritten.
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*/
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extern void strbuf_insert(struct strbuf *, size_t pos, const void *, size_t);
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/**
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* Remove given amount of data from a given position of the buffer.
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*/
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extern void strbuf_remove(struct strbuf *, size_t pos, size_t len);
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/**
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* Remove the bytes between `pos..pos+len` and replace it with the given
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* data.
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*/
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extern void strbuf_splice(struct strbuf *, size_t pos, size_t len,
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const void *, size_t);
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/**
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* Add a NUL-terminated string to the buffer. Each line will be prepended
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* by a comment character and a blank.
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*/
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extern void strbuf_add_commented_lines(struct strbuf *out, const char *buf, size_t size);
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/**
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* Add data of given length to the buffer.
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*/
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extern void strbuf_add(struct strbuf *, const void *, size_t);
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/**
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* Add a NUL-terminated string to the buffer.
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*
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* NOTE: This function will *always* be implemented as an inline or a macro
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* using strlen, meaning that this is efficient to write things like:
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*
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* strbuf_addstr(sb, "immediate string");
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*
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*/
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static inline void strbuf_addstr(struct strbuf *sb, const char *s)
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{
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strbuf_add(sb, s, strlen(s));
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}
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/**
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* Copy the contents of another buffer at the end of the current one.
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*/
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extern void strbuf_addbuf(struct strbuf *sb, const struct strbuf *sb2);
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/**
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* Copy part of the buffer from a given position till a given length to the
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* end of the buffer.
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*/
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extern void strbuf_adddup(struct strbuf *sb, size_t pos, size_t len);
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/**
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* This function can be used to expand a format string containing
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* placeholders. To that end, it parses the string and calls the specified
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* function for every percent sign found.
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*
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* The callback function is given a pointer to the character after the `%`
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* and a pointer to the struct strbuf. It is expected to add the expanded
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* version of the placeholder to the strbuf, e.g. to add a newline
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* character if the letter `n` appears after a `%`. The function returns
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* the length of the placeholder recognized and `strbuf_expand()` skips
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* over it.
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*
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* The format `%%` is automatically expanded to a single `%` as a quoting
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* mechanism; callers do not need to handle the `%` placeholder themselves,
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* and the callback function will not be invoked for this placeholder.
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*
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* All other characters (non-percent and not skipped ones) are copied
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* verbatim to the strbuf. If the callback returned zero, meaning that the
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* placeholder is unknown, then the percent sign is copied, too.
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*
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* In order to facilitate caching and to make it possible to give
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* parameters to the callback, `strbuf_expand()` passes a context pointer,
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* which can be used by the programmer of the callback as she sees fit.
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*/
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typedef size_t (*expand_fn_t) (struct strbuf *sb, const char *placeholder, void *context);
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extern void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn, void *context);
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/**
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* Used as callback for `strbuf_expand()`, expects an array of
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* struct strbuf_expand_dict_entry as context, i.e. pairs of
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* placeholder and replacement string. The array needs to be
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* terminated by an entry with placeholder set to NULL.
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*/
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struct strbuf_expand_dict_entry {
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const char *placeholder;
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const char *value;
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};
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extern size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder, void *context);
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/**
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* Append the contents of one strbuf to another, quoting any
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* percent signs ("%") into double-percents ("%%") in the
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* destination. This is useful for literal data to be fed to either
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* strbuf_expand or to the *printf family of functions.
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*/
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extern void strbuf_addbuf_percentquote(struct strbuf *dst, const struct strbuf *src);
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/**
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* Append the given byte size as a human-readable string (i.e. 12.23 KiB,
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* 3.50 MiB).
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*/
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extern void strbuf_humanise_bytes(struct strbuf *buf, off_t bytes);
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/**
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* Add a formatted string to the buffer.
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*/
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__attribute__((format (printf,2,3)))
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extern void strbuf_addf(struct strbuf *sb, const char *fmt, ...);
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/**
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* Add a formatted string prepended by a comment character and a
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* blank to the buffer.
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*/
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__attribute__((format (printf, 2, 3)))
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extern void strbuf_commented_addf(struct strbuf *sb, const char *fmt, ...);
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__attribute__((format (printf,2,0)))
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extern void strbuf_vaddf(struct strbuf *sb, const char *fmt, va_list ap);
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/**
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* Add the time specified by `tm`, as formatted by `strftime`.
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*/
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extern void strbuf_addftime(struct strbuf *sb, const char *fmt, const struct tm *tm);
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/**
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* Read a given size of data from a FILE* pointer to the buffer.
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*
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* NOTE: The buffer is rewound if the read fails. If -1 is returned,
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* `errno` must be consulted, like you would do for `read(3)`.
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* `strbuf_read()`, `strbuf_read_file()` and `strbuf_getline_*()`
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* family of functions have the same behaviour as well.
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*/
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extern size_t strbuf_fread(struct strbuf *, size_t, FILE *);
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/**
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* Read the contents of a given file descriptor. The third argument can be
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* used to give a hint about the file size, to avoid reallocs. If read fails,
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* any partial read is undone.
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*/
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extern ssize_t strbuf_read(struct strbuf *, int fd, size_t hint);
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/**
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* Read the contents of a given file descriptor partially by using only one
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* attempt of xread. The third argument can be used to give a hint about the
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* file size, to avoid reallocs. Returns the number of new bytes appended to
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* the sb.
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*/
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extern ssize_t strbuf_read_once(struct strbuf *, int fd, size_t hint);
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/**
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* Read the contents of a file, specified by its path. The third argument
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* can be used to give a hint about the file size, to avoid reallocs.
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* Return the number of bytes read or a negative value if some error
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* occurred while opening or reading the file.
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*/
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extern ssize_t strbuf_read_file(struct strbuf *sb, const char *path, size_t hint);
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/**
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* Read the target of a symbolic link, specified by its path. The third
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* argument can be used to give a hint about the size, to avoid reallocs.
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*/
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extern int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint);
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/**
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* Write the whole content of the strbuf to the stream not stopping at
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* NUL bytes.
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*/
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extern ssize_t strbuf_write(struct strbuf *sb, FILE *stream);
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/**
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* Read a line from a FILE *, overwriting the existing contents of
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* the strbuf. The strbuf_getline*() family of functions share
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* this signature, but have different line termination conventions.
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*
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* Reading stops after the terminator or at EOF. The terminator
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* is removed from the buffer before returning. Returns 0 unless
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* there was nothing left before EOF, in which case it returns `EOF`.
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*/
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typedef int (*strbuf_getline_fn)(struct strbuf *, FILE *);
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/* Uses LF as the line terminator */
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extern int strbuf_getline_lf(struct strbuf *sb, FILE *fp);
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/* Uses NUL as the line terminator */
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extern int strbuf_getline_nul(struct strbuf *sb, FILE *fp);
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/*
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* Similar to strbuf_getline_lf(), but additionally treats a CR that
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* comes immediately before the LF as part of the terminator.
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* This is the most friendly version to be used to read "text" files
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* that can come from platforms whose native text format is CRLF
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* terminated.
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*/
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extern int strbuf_getline(struct strbuf *, FILE *);
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/**
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* Like `strbuf_getline`, but keeps the trailing terminator (if
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* any) in the buffer.
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*/
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extern int strbuf_getwholeline(struct strbuf *, FILE *, int);
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/**
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* Like `strbuf_getwholeline`, but operates on a file descriptor.
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* It reads one character at a time, so it is very slow. Do not
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* use it unless you need the correct position in the file
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* descriptor.
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*/
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extern int strbuf_getwholeline_fd(struct strbuf *, int, int);
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/**
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* Set the buffer to the path of the current working directory.
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*/
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extern int strbuf_getcwd(struct strbuf *sb);
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/**
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* Add a path to a buffer, converting a relative path to an
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* absolute one in the process. Symbolic links are not
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* resolved.
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*/
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extern void strbuf_add_absolute_path(struct strbuf *sb, const char *path);
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/**
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* Normalize in-place the path contained in the strbuf. See
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* normalize_path_copy() for details. If an error occurs, the contents of "sb"
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* are left untouched, and -1 is returned.
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*/
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extern int strbuf_normalize_path(struct strbuf *sb);
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/**
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* Strip whitespace from a buffer. The second parameter controls if
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* comments are considered contents to be removed or not.
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*/
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extern void strbuf_stripspace(struct strbuf *buf, int skip_comments);
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/**
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* Temporary alias until all topic branches have switched to use
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* strbuf_stripspace directly.
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*/
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static inline void stripspace(struct strbuf *buf, int skip_comments)
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{
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strbuf_stripspace(buf, skip_comments);
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}
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static inline int strbuf_strip_suffix(struct strbuf *sb, const char *suffix)
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{
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if (strip_suffix_mem(sb->buf, &sb->len, suffix)) {
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strbuf_setlen(sb, sb->len);
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return 1;
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} else
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return 0;
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}
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/**
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* Split str (of length slen) at the specified terminator character.
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* Return a null-terminated array of pointers to strbuf objects
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* holding the substrings. The substrings include the terminator,
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* except for the last substring, which might be unterminated if the
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* original string did not end with a terminator. If max is positive,
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* then split the string into at most max substrings (with the last
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* substring containing everything following the (max-1)th terminator
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* character).
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*
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* The most generic form is `strbuf_split_buf`, which takes an arbitrary
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* pointer/len buffer. The `_str` variant takes a NUL-terminated string,
|
|
* the `_max` variant takes a strbuf, and just `strbuf_split` is a convenience
|
|
* wrapper to drop the `max` parameter.
|
|
*
|
|
* For lighter-weight alternatives, see string_list_split() and
|
|
* string_list_split_in_place().
|
|
*/
|
|
extern struct strbuf **strbuf_split_buf(const char *, size_t,
|
|
int terminator, int max);
|
|
|
|
static inline struct strbuf **strbuf_split_str(const char *str,
|
|
int terminator, int max)
|
|
{
|
|
return strbuf_split_buf(str, strlen(str), terminator, max);
|
|
}
|
|
|
|
static inline struct strbuf **strbuf_split_max(const struct strbuf *sb,
|
|
int terminator, int max)
|
|
{
|
|
return strbuf_split_buf(sb->buf, sb->len, terminator, max);
|
|
}
|
|
|
|
static inline struct strbuf **strbuf_split(const struct strbuf *sb,
|
|
int terminator)
|
|
{
|
|
return strbuf_split_max(sb, terminator, 0);
|
|
}
|
|
|
|
/**
|
|
* Free a NULL-terminated list of strbufs (for example, the return
|
|
* values of the strbuf_split*() functions).
|
|
*/
|
|
extern void strbuf_list_free(struct strbuf **);
|
|
|
|
/**
|
|
* Add the abbreviation, as generated by find_unique_abbrev, of `sha1` to
|
|
* the strbuf `sb`.
|
|
*/
|
|
extern void strbuf_add_unique_abbrev(struct strbuf *sb,
|
|
const unsigned char *sha1,
|
|
int abbrev_len);
|
|
|
|
/**
|
|
* Launch the user preferred editor to edit a file and fill the buffer
|
|
* with the file's contents upon the user completing their editing. The
|
|
* third argument can be used to set the environment which the editor is
|
|
* run in. If the buffer is NULL the editor is launched as usual but the
|
|
* file's contents are not read into the buffer upon completion.
|
|
*/
|
|
extern int launch_editor(const char *path, struct strbuf *buffer, const char *const *env);
|
|
|
|
extern void strbuf_add_lines(struct strbuf *sb, const char *prefix, const char *buf, size_t size);
|
|
|
|
/**
|
|
* Append s to sb, with the characters '<', '>', '&' and '"' converted
|
|
* into XML entities.
|
|
*/
|
|
extern void strbuf_addstr_xml_quoted(struct strbuf *sb, const char *s);
|
|
|
|
/**
|
|
* "Complete" the contents of `sb` by ensuring that either it ends with the
|
|
* character `term`, or it is empty. This can be used, for example,
|
|
* to ensure that text ends with a newline, but without creating an empty
|
|
* blank line if there is no content in the first place.
|
|
*/
|
|
static inline void strbuf_complete(struct strbuf *sb, char term)
|
|
{
|
|
if (sb->len && sb->buf[sb->len - 1] != term)
|
|
strbuf_addch(sb, term);
|
|
}
|
|
|
|
static inline void strbuf_complete_line(struct strbuf *sb)
|
|
{
|
|
strbuf_complete(sb, '\n');
|
|
}
|
|
|
|
extern int strbuf_branchname(struct strbuf *sb, const char *name);
|
|
extern int strbuf_check_branch_ref(struct strbuf *sb, const char *name);
|
|
|
|
extern void strbuf_addstr_urlencode(struct strbuf *, const char *,
|
|
int reserved);
|
|
|
|
__attribute__((format (printf,1,2)))
|
|
extern int printf_ln(const char *fmt, ...);
|
|
__attribute__((format (printf,2,3)))
|
|
extern int fprintf_ln(FILE *fp, const char *fmt, ...);
|
|
|
|
char *xstrdup_tolower(const char *);
|
|
|
|
/**
|
|
* Create a newly allocated string using printf format. You can do this easily
|
|
* with a strbuf, but this provides a shortcut to save a few lines.
|
|
*/
|
|
__attribute__((format (printf, 1, 0)))
|
|
char *xstrvfmt(const char *fmt, va_list ap);
|
|
__attribute__((format (printf, 1, 2)))
|
|
char *xstrfmt(const char *fmt, ...);
|
|
|
|
#endif /* STRBUF_H */
|