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/* Taken from git by Liu Yuan <namei.unix@gmail.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "strbuf.h"
#include "logger.h"
void strbuf_init(struct strbuf *sb, size_t hint)
{
memset(sb, 0, sizeof(*sb));
if (hint)
strbuf_grow(sb, hint);
}
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, 0);
return res;
}
void strbuf_attach(struct strbuf *sb, void *buf, size_t len, size_t alloc)
{
strbuf_release(sb);
sb->buf = buf;
sb->len = len;
sb->alloc = alloc;
strbuf_grow(sb, 0);
sb->buf[sb->len] = '\0';
}
notrace void strbuf_grow(struct strbuf *sb, size_t extra)
{
if (sb->len + extra + 1 <= sb->len)
panic("you want to use way too much memory");
ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
}
void strbuf_rtrim(struct strbuf *sb)
{
while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
sb->len--;
sb->buf[sb->len] = '\0';
}
void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
{
strbuf_grow(sb, len);
if (pos > sb->len)
panic("`pos' is too far after the end of the buffer");
memmove(sb->buf + pos + len, sb->buf + pos, sb->len - pos);
memcpy(sb->buf + pos, data, len);
strbuf_setlen(sb, sb->len + len);
}
void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
const void *data, size_t dlen)
{
if (pos + len < pos)
panic("you want to use way too much memory");
if (pos > sb->len)
panic("`pos' is too far after the end of the buffer");
if (pos + len > sb->len)
panic("`pos + len' is too far after the end of the buffer");
if (dlen >= len)
strbuf_grow(sb, dlen - len);
memmove(sb->buf + pos + dlen,
sb->buf + pos + len,
sb->len - pos - len);
memcpy(sb->buf + pos, data, dlen);
strbuf_setlen(sb, sb->len + dlen - len);
}
void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
{
strbuf_splice(sb, pos, len, NULL, 0);
}
notrace 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))
panic("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 hint)
{
size_t oldlen = sb->len;
strbuf_grow(sb, hint ? hint : 8192);
for (;;) {
ssize_t cnt;
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;
strbuf_grow(sb, 8192);
}
sb->buf[sb->len] = '\0';
return sb->len - oldlen;
}
static int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
{
int ch;
if (feof(fp))
return EOF;
strbuf_reset(sb);
while ((ch = fgetc(fp)) != EOF) {
strbuf_grow(sb, 1);
sb->buf[sb->len++] = ch;
if (ch == term)
break;
}
if (ch == EOF && sb->len == 0)
return EOF;
sb->buf[sb->len] = '\0';
return 0;
}
int strbuf_getline(struct strbuf *sb, FILE *fp, int term)
{
if (strbuf_getwholeline(sb, fp, term))
return EOF;
if (sb->buf[sb->len-1] == term)
strbuf_setlen(sb, sb->len-1);
return 0;
}
int strbuf_copyout(struct strbuf *sb, void *buf, size_t len)
{
len = min(len, sb->len + 1);
memcpy(buf, sb->buf, len);
return len;
}
int strbuf_stripout(struct strbuf *sb, void *buf, size_t len)
{
len = min(len, sb->len);
if (len == 0)
goto out;
memcpy(buf, sb->buf, len);
strbuf_remove(sb, 0, len);
out:
return len;
}
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