* Adding data to the buffer
-NOTE: All of these functions in this section will grow the buffer as
- necessary.
+NOTE: All of the functions in this section will grow the buffer as necessary.
+If they fail for some reason other than memory shortage and the buffer hadn't
+been allocated before (i.e. the `struct strbuf` was set to `STRBUF_INIT`),
+then they will free() it.
`strbuf_addch`::
Read the contents of a file, specified by its path. The third argument
can be used to give a hint about the file size, to avoid reallocs.
+`strbuf_readlink`::
+
+ Read the target of a symbolic link, specified by its path. The third
+ argument can be used to give a hint about the size, to avoid reallocs.
+
`strbuf_getline`::
Read a line from a FILE* pointer. The second argument specifies the line
size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
{
size_t res;
+ size_t oldalloc = sb->alloc;
strbuf_grow(sb, size);
res = fread(sb->buf + sb->len, 1, size, f);
- if (res > 0) {
+ if (res > 0)
strbuf_setlen(sb, sb->len + res);
- }
+ else if (res < 0 && oldalloc == 0)
+ strbuf_release(sb);
return res;
}
ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
{
size_t oldlen = sb->len;
+ size_t oldalloc = sb->alloc;
strbuf_grow(sb, hint ? hint : 8192);
for (;;) {
cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
if (cnt < 0) {
- strbuf_setlen(sb, oldlen);
+ if (oldalloc == 0)
+ strbuf_release(sb);
+ else
+ strbuf_setlen(sb, oldlen);
return -1;
}
if (!cnt)
int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint)
{
+ size_t oldalloc = sb->alloc;
+
if (hint < 32)
hint = 32;
/* .. the buffer was too small - try again */
hint *= 2;
}
- strbuf_release(sb);
+ if (oldalloc == 0)
+ strbuf_release(sb);
return -1;
}