git/strbuf.h
René Scharfe 7141efab24 strbuf: clarify assertion in strbuf_setlen()
Commit a8f3e2219 introduced the strbuf_grow() call to strbuf_setlen() to
make ensure that there was at least one byte available to write the
mandatory trailing NUL, even for previously unallocated strbufs.

Then b315c5c0 added strbuf_slopbuf for the same reason, only globally for
all uses of strbufs.

Thus the strbuf_grow() call can be removed now.  This avoids readers of
strbuf.h from mistakenly thinking that strbuf_setlen() can be used to
extend a strbuf.

The following assert() needs to be changed to cope with the fact that
sb->alloc can now be zero, which is OK as long as len is also zero.  As
suggested by Junio, use the chance to convert it to a die() with a short
explanatory message.  The pattern of 'die("BUG: ...")' is already used in
strbuf.c.

This was the only assert() in strbuf.[ch], so assert.h doesn't have to be
included anymore either.

Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-04-27 10:52:15 -07:00

104 lines
3.6 KiB
C

#ifndef STRBUF_H
#define STRBUF_H
/* See Documentation/technical/api-strbuf.txt */
extern char strbuf_slopbuf[];
struct strbuf {
size_t alloc;
size_t len;
char *buf;
};
#define STRBUF_INIT { 0, 0, strbuf_slopbuf }
/*----- strbuf life cycle -----*/
extern void strbuf_init(struct strbuf *, size_t);
extern void strbuf_release(struct strbuf *);
extern char *strbuf_detach(struct strbuf *, size_t *);
extern void strbuf_attach(struct strbuf *, void *, size_t, size_t);
static inline void strbuf_swap(struct strbuf *a, struct strbuf *b) {
struct strbuf tmp = *a;
*a = *b;
*b = tmp;
}
/*----- strbuf size related -----*/
static inline size_t strbuf_avail(const struct strbuf *sb) {
return sb->alloc ? sb->alloc - sb->len - 1 : 0;
}
extern void strbuf_grow(struct strbuf *, size_t);
static inline void strbuf_setlen(struct strbuf *sb, size_t len) {
if (len > (sb->alloc ? sb->alloc - 1 : 0))
die("BUG: strbuf_setlen() beyond buffer");
sb->len = len;
sb->buf[len] = '\0';
}
#define strbuf_reset(sb) strbuf_setlen(sb, 0)
/*----- content related -----*/
extern void strbuf_trim(struct strbuf *);
extern void strbuf_rtrim(struct strbuf *);
extern void strbuf_ltrim(struct strbuf *);
extern int strbuf_cmp(const struct strbuf *, const struct strbuf *);
extern struct strbuf **strbuf_split(const struct strbuf *, int delim);
extern void strbuf_list_free(struct strbuf **);
/*----- add data in your buffer -----*/
static inline void strbuf_addch(struct strbuf *sb, int c) {
strbuf_grow(sb, 1);
sb->buf[sb->len++] = c;
sb->buf[sb->len] = '\0';
}
extern void strbuf_insert(struct strbuf *, size_t pos, const void *, size_t);
extern void strbuf_remove(struct strbuf *, size_t pos, size_t len);
/* splice pos..pos+len with given data */
extern void strbuf_splice(struct strbuf *, size_t pos, size_t len,
const void *, size_t);
extern void strbuf_add(struct strbuf *, const void *, size_t);
static inline void strbuf_addstr(struct strbuf *sb, const char *s) {
strbuf_add(sb, s, strlen(s));
}
static inline void strbuf_addbuf(struct strbuf *sb, const struct strbuf *sb2) {
strbuf_grow(sb, sb2->len);
strbuf_add(sb, sb2->buf, sb2->len);
}
extern void strbuf_adddup(struct strbuf *sb, size_t pos, size_t len);
typedef size_t (*expand_fn_t) (struct strbuf *sb, const char *placeholder, void *context);
extern void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn, void *context);
struct strbuf_expand_dict_entry {
const char *placeholder;
const char *value;
};
extern size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder, void *context);
extern void strbuf_addbuf_percentquote(struct strbuf *dst, const struct strbuf *src);
__attribute__((format (printf,2,3)))
extern void strbuf_addf(struct strbuf *sb, const char *fmt, ...);
__attribute__((format (printf,2,0)))
extern void strbuf_vaddf(struct strbuf *sb, const char *fmt, va_list ap);
extern size_t strbuf_fread(struct strbuf *, size_t, FILE *);
/* XXX: if read fails, any partial read is undone */
extern ssize_t strbuf_read(struct strbuf *, int fd, size_t hint);
extern int strbuf_read_file(struct strbuf *sb, const char *path, size_t hint);
extern int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint);
extern int strbuf_getwholeline(struct strbuf *, FILE *, int);
extern int strbuf_getline(struct strbuf *, FILE *, int);
extern void stripspace(struct strbuf *buf, int skip_comments);
extern int launch_editor(const char *path, struct strbuf *buffer, const char *const *env);
extern int strbuf_branchname(struct strbuf *sb, const char *name);
extern int strbuf_check_branch_ref(struct strbuf *sb, const char *name);
#endif /* STRBUF_H */