mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-24 01:36:48 +07:00
74cf249d5c
Several areas already used this technique, so do some audit to consistently use it elsewhere. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-9sbere0kkplwe45ak6rk4a1f@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
135 lines
2.9 KiB
C
135 lines
2.9 KiB
C
#include "cache.h"
|
|
#include <linux/kernel.h>
|
|
|
|
int prefixcmp(const char *str, const char *prefix)
|
|
{
|
|
for (; ; str++, prefix++)
|
|
if (!*prefix)
|
|
return 0;
|
|
else if (*str != *prefix)
|
|
return (unsigned char)*prefix - (unsigned char)*str;
|
|
}
|
|
|
|
/*
|
|
* Used as the default ->buf value, so that people can always assume
|
|
* buf is non NULL and ->buf is NUL terminated even for a freshly
|
|
* initialized strbuf.
|
|
*/
|
|
char strbuf_slopbuf[1];
|
|
|
|
void strbuf_init(struct strbuf *sb, ssize_t hint)
|
|
{
|
|
sb->alloc = sb->len = 0;
|
|
sb->buf = strbuf_slopbuf;
|
|
if (hint)
|
|
strbuf_grow(sb, hint);
|
|
}
|
|
|
|
void strbuf_release(struct strbuf *sb)
|
|
{
|
|
if (sb->alloc) {
|
|
zfree(&sb->buf);
|
|
strbuf_init(sb, 0);
|
|
}
|
|
}
|
|
|
|
char *strbuf_detach(struct strbuf *sb, size_t *sz)
|
|
{
|
|
char *res = sb->alloc ? sb->buf : NULL;
|
|
if (sz)
|
|
*sz = sb->len;
|
|
strbuf_init(sb, 0);
|
|
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");
|
|
if (!sb->alloc)
|
|
sb->buf = NULL;
|
|
ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
|
|
}
|
|
|
|
static void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
|
|
const void *data, size_t dlen)
|
|
{
|
|
if (pos + len < pos)
|
|
die("you want to use way too much memory");
|
|
if (pos > sb->len)
|
|
die("`pos' is too far after the end of the buffer");
|
|
if (pos + len > sb->len)
|
|
die("`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);
|
|
}
|
|
|
|
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;
|
|
|
|
if (!strbuf_avail(sb))
|
|
strbuf_grow(sb, 64);
|
|
va_start(ap, fmt);
|
|
len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
|
|
va_end(ap);
|
|
if (len < 0)
|
|
die("your vsnprintf is broken");
|
|
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 vsnprintf is broken");
|
|
}
|
|
}
|
|
strbuf_setlen(sb, sb->len + len);
|
|
}
|
|
|
|
ssize_t strbuf_read(struct strbuf *sb, int fd, ssize_t hint)
|
|
{
|
|
size_t oldlen = sb->len;
|
|
size_t oldalloc = sb->alloc;
|
|
|
|
strbuf_grow(sb, hint ? hint : 8192);
|
|
for (;;) {
|
|
ssize_t cnt;
|
|
|
|
cnt = read(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
|
|
if (cnt < 0) {
|
|
if (oldalloc == 0)
|
|
strbuf_release(sb);
|
|
else
|
|
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;
|
|
}
|