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ac1373f1c2
* tr/maint-bundle-long-subject: t5704: match tests to modern style strbuf: improve strbuf_get*line documentation bundle: use a strbuf to scan the log for boundary commits bundle: put strbuf_readline_fd in strbuf.c with adjustments
466 lines
9.3 KiB
C
466 lines
9.3 KiB
C
#include "cache.h"
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#include "refs.h"
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int prefixcmp(const char *str, const char *prefix)
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{
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for (; ; str++, prefix++)
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if (!*prefix)
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return 0;
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else if (*str != *prefix)
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return (unsigned char)*prefix - (unsigned char)*str;
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}
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int suffixcmp(const char *str, const char *suffix)
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{
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int len = strlen(str), suflen = strlen(suffix);
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if (len < suflen)
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return -1;
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else
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return strcmp(str + len - suflen, suffix);
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}
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/*
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* Used as the default ->buf value, so that people can always assume
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* buf is non NULL and ->buf is NUL terminated even for a freshly
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* initialized strbuf.
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*/
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char strbuf_slopbuf[1];
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void strbuf_init(struct strbuf *sb, size_t hint)
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{
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sb->alloc = sb->len = 0;
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sb->buf = strbuf_slopbuf;
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if (hint)
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strbuf_grow(sb, hint);
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}
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void strbuf_release(struct strbuf *sb)
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{
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if (sb->alloc) {
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free(sb->buf);
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strbuf_init(sb, 0);
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}
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}
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char *strbuf_detach(struct strbuf *sb, size_t *sz)
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{
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char *res = sb->alloc ? sb->buf : NULL;
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if (sz)
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*sz = sb->len;
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strbuf_init(sb, 0);
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return res;
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}
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void strbuf_attach(struct strbuf *sb, void *buf, size_t len, size_t alloc)
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{
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strbuf_release(sb);
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sb->buf = buf;
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sb->len = len;
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sb->alloc = alloc;
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strbuf_grow(sb, 0);
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sb->buf[sb->len] = '\0';
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}
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void strbuf_grow(struct strbuf *sb, size_t extra)
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{
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int new_buf = !sb->alloc;
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if (unsigned_add_overflows(extra, 1) ||
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unsigned_add_overflows(sb->len, extra + 1))
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die("you want to use way too much memory");
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if (new_buf)
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sb->buf = NULL;
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ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
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if (new_buf)
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sb->buf[0] = '\0';
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}
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void strbuf_trim(struct strbuf *sb)
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{
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char *b = sb->buf;
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while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
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sb->len--;
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while (sb->len > 0 && isspace(*b)) {
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b++;
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sb->len--;
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}
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memmove(sb->buf, b, sb->len);
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sb->buf[sb->len] = '\0';
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}
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void strbuf_rtrim(struct strbuf *sb)
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{
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while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
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sb->len--;
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sb->buf[sb->len] = '\0';
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}
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void strbuf_ltrim(struct strbuf *sb)
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{
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char *b = sb->buf;
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while (sb->len > 0 && isspace(*b)) {
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b++;
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sb->len--;
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}
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memmove(sb->buf, b, sb->len);
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sb->buf[sb->len] = '\0';
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}
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struct strbuf **strbuf_split_buf(const char *str, size_t slen, int delim, int max)
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{
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int alloc = 2, pos = 0;
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const char *n, *p;
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struct strbuf **ret;
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struct strbuf *t;
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ret = xcalloc(alloc, sizeof(struct strbuf *));
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p = n = str;
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while (n < str + slen) {
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int len;
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if (max <= 0 || pos + 1 < max)
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n = memchr(n, delim, slen - (n - str));
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else
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n = NULL;
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if (pos + 1 >= alloc) {
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alloc = alloc * 2;
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ret = xrealloc(ret, sizeof(struct strbuf *) * alloc);
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}
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if (!n)
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n = str + slen - 1;
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len = n - p + 1;
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t = xmalloc(sizeof(struct strbuf));
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strbuf_init(t, len);
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strbuf_add(t, p, len);
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ret[pos] = t;
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ret[++pos] = NULL;
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p = ++n;
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}
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return ret;
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}
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void strbuf_list_free(struct strbuf **sbs)
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{
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struct strbuf **s = sbs;
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while (*s) {
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strbuf_release(*s);
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free(*s++);
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}
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free(sbs);
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}
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int strbuf_cmp(const struct strbuf *a, const struct strbuf *b)
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{
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int len = a->len < b->len ? a->len: b->len;
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int cmp = memcmp(a->buf, b->buf, len);
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if (cmp)
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return cmp;
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return a->len < b->len ? -1: a->len != b->len;
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}
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void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
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const void *data, size_t dlen)
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{
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if (unsigned_add_overflows(pos, len))
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die("you want to use way too much memory");
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if (pos > sb->len)
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die("`pos' is too far after the end of the buffer");
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if (pos + len > sb->len)
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die("`pos + len' is too far after the end of the buffer");
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if (dlen >= len)
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strbuf_grow(sb, dlen - len);
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memmove(sb->buf + pos + dlen,
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sb->buf + pos + len,
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sb->len - pos - len);
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memcpy(sb->buf + pos, data, dlen);
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strbuf_setlen(sb, sb->len + dlen - len);
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}
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void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
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{
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strbuf_splice(sb, pos, 0, data, len);
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}
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void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
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{
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strbuf_splice(sb, pos, len, NULL, 0);
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}
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void strbuf_add(struct strbuf *sb, const void *data, size_t len)
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{
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strbuf_grow(sb, len);
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memcpy(sb->buf + sb->len, data, len);
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strbuf_setlen(sb, sb->len + len);
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}
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void strbuf_adddup(struct strbuf *sb, size_t pos, size_t len)
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{
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strbuf_grow(sb, len);
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memcpy(sb->buf + sb->len, sb->buf + pos, len);
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strbuf_setlen(sb, sb->len + len);
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}
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void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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strbuf_vaddf(sb, fmt, ap);
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va_end(ap);
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}
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void strbuf_vaddf(struct strbuf *sb, const char *fmt, va_list ap)
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{
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int len;
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va_list cp;
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if (!strbuf_avail(sb))
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strbuf_grow(sb, 64);
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va_copy(cp, ap);
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len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, cp);
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va_end(cp);
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if (len < 0)
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die("BUG: your vsnprintf is broken (returned %d)", len);
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if (len > strbuf_avail(sb)) {
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strbuf_grow(sb, len);
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len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
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if (len > strbuf_avail(sb))
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die("BUG: your vsnprintf is broken (insatiable)");
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}
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strbuf_setlen(sb, sb->len + len);
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}
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void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn,
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void *context)
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{
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for (;;) {
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const char *percent;
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size_t consumed;
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percent = strchrnul(format, '%');
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strbuf_add(sb, format, percent - format);
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if (!*percent)
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break;
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format = percent + 1;
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if (*format == '%') {
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strbuf_addch(sb, '%');
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format++;
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continue;
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}
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consumed = fn(sb, format, context);
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if (consumed)
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format += consumed;
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else
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strbuf_addch(sb, '%');
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}
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}
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size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder,
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void *context)
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{
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struct strbuf_expand_dict_entry *e = context;
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size_t len;
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for (; e->placeholder && (len = strlen(e->placeholder)); e++) {
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if (!strncmp(placeholder, e->placeholder, len)) {
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if (e->value)
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strbuf_addstr(sb, e->value);
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return len;
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}
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}
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return 0;
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}
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void strbuf_addbuf_percentquote(struct strbuf *dst, const struct strbuf *src)
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{
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int i, len = src->len;
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for (i = 0; i < len; i++) {
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if (src->buf[i] == '%')
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strbuf_addch(dst, '%');
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strbuf_addch(dst, src->buf[i]);
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}
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}
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size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
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{
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size_t res;
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size_t oldalloc = sb->alloc;
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strbuf_grow(sb, size);
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res = fread(sb->buf + sb->len, 1, size, f);
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if (res > 0)
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strbuf_setlen(sb, sb->len + res);
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else if (oldalloc == 0)
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strbuf_release(sb);
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return res;
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}
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ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
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{
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size_t oldlen = sb->len;
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size_t oldalloc = sb->alloc;
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strbuf_grow(sb, hint ? hint : 8192);
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for (;;) {
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ssize_t cnt;
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cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
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if (cnt < 0) {
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if (oldalloc == 0)
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strbuf_release(sb);
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else
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strbuf_setlen(sb, oldlen);
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return -1;
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}
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if (!cnt)
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break;
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sb->len += cnt;
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strbuf_grow(sb, 8192);
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}
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sb->buf[sb->len] = '\0';
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return sb->len - oldlen;
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}
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#define STRBUF_MAXLINK (2*PATH_MAX)
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int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint)
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{
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size_t oldalloc = sb->alloc;
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if (hint < 32)
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hint = 32;
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while (hint < STRBUF_MAXLINK) {
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int len;
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strbuf_grow(sb, hint);
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len = readlink(path, sb->buf, hint);
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if (len < 0) {
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if (errno != ERANGE)
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break;
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} else if (len < hint) {
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strbuf_setlen(sb, len);
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return 0;
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}
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/* .. the buffer was too small - try again */
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hint *= 2;
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}
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if (oldalloc == 0)
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strbuf_release(sb);
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return -1;
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}
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int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
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{
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int ch;
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if (feof(fp))
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return EOF;
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strbuf_reset(sb);
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while ((ch = fgetc(fp)) != EOF) {
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strbuf_grow(sb, 1);
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sb->buf[sb->len++] = ch;
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if (ch == term)
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break;
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}
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if (ch == EOF && sb->len == 0)
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return EOF;
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sb->buf[sb->len] = '\0';
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return 0;
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}
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int strbuf_getline(struct strbuf *sb, FILE *fp, int term)
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{
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if (strbuf_getwholeline(sb, fp, term))
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return EOF;
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if (sb->buf[sb->len-1] == term)
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strbuf_setlen(sb, sb->len-1);
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return 0;
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}
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int strbuf_getwholeline_fd(struct strbuf *sb, int fd, int term)
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{
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strbuf_reset(sb);
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while (1) {
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char ch;
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ssize_t len = xread(fd, &ch, 1);
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if (len <= 0)
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return EOF;
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strbuf_addch(sb, ch);
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if (ch == term)
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break;
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}
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return 0;
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}
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int strbuf_read_file(struct strbuf *sb, const char *path, size_t hint)
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{
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int fd, len;
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fd = open(path, O_RDONLY);
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if (fd < 0)
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return -1;
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len = strbuf_read(sb, fd, hint);
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close(fd);
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if (len < 0)
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return -1;
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return len;
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}
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void strbuf_add_lines(struct strbuf *out, const char *prefix,
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const char *buf, size_t size)
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{
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while (size) {
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const char *next = memchr(buf, '\n', size);
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next = next ? (next + 1) : (buf + size);
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strbuf_addstr(out, prefix);
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strbuf_add(out, buf, next - buf);
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size -= next - buf;
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buf = next;
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}
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strbuf_complete_line(out);
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}
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static int is_rfc3986_reserved(char ch)
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{
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switch (ch) {
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case '!': case '*': case '\'': case '(': case ')': case ';':
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case ':': case '@': case '&': case '=': case '+': case '$':
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case ',': case '/': case '?': case '#': case '[': case ']':
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return 1;
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}
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return 0;
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}
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static int is_rfc3986_unreserved(char ch)
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{
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return isalnum(ch) ||
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ch == '-' || ch == '_' || ch == '.' || ch == '~';
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}
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void strbuf_add_urlencode(struct strbuf *sb, const char *s, size_t len,
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int reserved)
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{
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strbuf_grow(sb, len);
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while (len--) {
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char ch = *s++;
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if (is_rfc3986_unreserved(ch) ||
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(!reserved && is_rfc3986_reserved(ch)))
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strbuf_addch(sb, ch);
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else
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strbuf_addf(sb, "%%%02x", ch);
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}
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}
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void strbuf_addstr_urlencode(struct strbuf *sb, const char *s,
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int reserved)
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{
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strbuf_add_urlencode(sb, s, strlen(s), reserved);
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}
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