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#include "cache.h"
#include "strbuf.h"
void strbuf_init(struct strbuf *sb) {
memset(sb, 0, sizeof(*sb));
}
void strbuf_release(struct strbuf *sb) {
free(sb->buf);
memset(sb, 0, sizeof(*sb));
}
void strbuf_reset(struct strbuf *sb) {
if (sb->len)
strbuf_setlen(sb, 0);
sb->eof = 0;
}
char *strbuf_detach(struct strbuf *sb) {
char *res = sb->buf;
strbuf_init(sb);
return res;
}
void strbuf_grow(struct strbuf *sb, size_t extra) {
if (sb->len + extra + 1 <= sb->len)
die("you want to use way too much memory");
ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
}
void strbuf_add(struct strbuf *sb, const void *data, size_t len) {
strbuf_grow(sb, len);
memcpy(sb->buf + sb->len, data, len);
strbuf_setlen(sb, sb->len + len);
}
void strbuf_addf(struct strbuf *sb, const char *fmt, ...) {
int len;
va_list ap;
va_start(ap, fmt);
len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
va_end(ap);
if (len < 0) {
len = 0;
}
if (len >= strbuf_avail(sb)) {
strbuf_grow(sb, len);
va_start(ap, fmt);
len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
va_end(ap);
if (len >= strbuf_avail(sb)) {
die("this should not happen, your snprintf is broken");
}
}
strbuf_setlen(sb, sb->len + len);
}
size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f) {
size_t res;
strbuf_grow(sb, size);
res = fread(sb->buf + sb->len, 1, size, f);
if (res > 0) {
strbuf_setlen(sb, sb->len + res);
}
return res;
}
ssize_t strbuf_read(struct strbuf *sb, int fd)
{
size_t oldlen = sb->len;
for (;;) {
ssize_t cnt;
strbuf_grow(sb, 8192);
cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
if (cnt < 0) {
strbuf_setlen(sb, oldlen);
return -1;
}
if (!cnt)
break;
sb->len += cnt;
}
sb->buf[sb->len] = '\0';
return sb->len - oldlen;
}
void read_line(struct strbuf *sb, FILE *fp, int term) {
int ch;
if (feof(fp)) {
strbuf_release(sb);
sb->eof = 1;
return;
}
strbuf_reset(sb);
while ((ch = fgetc(fp)) != EOF) {
if (ch == term)
break;
strbuf_grow(sb, 1);
sb->buf[sb->len++] = ch;
}
if (ch == EOF && sb->len == 0) {
strbuf_release(sb);
sb->eof = 1;
}
strbuf_grow(sb, 1);
sb->buf[sb->len] = '\0';
}
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