mirror of
https://github.com/git/git
synced 2024-11-05 18:59:29 +00:00
6651c3f706
size_t res cannot be less than 0. fread returns 0 on error. Reported-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Roel Kluin <roel.kluin@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
376 lines
7.5 KiB
C
376 lines
7.5 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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/*
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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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if (sb->len + extra + 1 <= sb->len)
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die("you want to use way too much memory");
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if (!sb->alloc)
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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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}
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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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void strbuf_tolower(struct strbuf *sb)
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{
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int i;
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for (i = 0; i < sb->len; i++)
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sb->buf[i] = tolower(sb->buf[i]);
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}
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struct strbuf **strbuf_split(const struct strbuf *sb, int delim)
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{
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int alloc = 2, pos = 0;
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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 = sb->buf;
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while (n < sb->buf + sb->len) {
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int len;
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n = memchr(n, delim, sb->len - (n - sb->buf));
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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 = sb->buf + sb->len - 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 (pos + len < pos)
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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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int len;
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va_list ap;
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if (!strbuf_avail(sb))
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strbuf_grow(sb, 64);
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va_start(ap, fmt);
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len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
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va_end(ap);
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if (len < 0)
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die("your vsnprintf is broken");
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if (len > strbuf_avail(sb)) {
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strbuf_grow(sb, len);
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va_start(ap, fmt);
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len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
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va_end(ap);
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if (len > strbuf_avail(sb)) {
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die("this should not happen, your snprintf is broken");
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}
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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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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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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_getline(struct strbuf *sb, FILE *fp, int term)
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{
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int ch;
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strbuf_grow(sb, 0);
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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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if (ch == term)
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break;
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strbuf_grow(sb, 1);
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sb->buf[sb->len++] = ch;
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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_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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int strbuf_branchname(struct strbuf *sb, const char *name)
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{
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int len = strlen(name);
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if (interpret_branch_name(name, sb) == len)
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return 0;
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strbuf_add(sb, name, len);
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return len;
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}
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int strbuf_check_branch_ref(struct strbuf *sb, const char *name)
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{
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strbuf_branchname(sb, name);
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strbuf_splice(sb, 0, 0, "refs/heads/", 11);
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return check_ref_format(sb->buf);
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}
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