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authorMasami Hiramatsu <mhiramat@kernel.org>2016-05-10 14:46:58 +0900
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-05-10 11:27:58 -0300
commit5cea57f30a12443c05e0c5273f35d2fcef00d30a (patch)
treeba665d63c69cc0ea73c0d6e8d622a4872c3a2b6e /tools/perf
parent9c7b37cd63d0d910c531233209286f169993cbd9 (diff)
downloadlinux-5cea57f30a12443c05e0c5273f35d2fcef00d30a.tar.gz
perf tools: Rewrite strbuf not to die()
Rewrite strbuf implementation not to use die() nor xrealloc(). Instead of die(), now most of the API returns error code or 0 if succeeded. Suggested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20160510054658.6158.24080.stgit@devbox Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf')
-rw-r--r--tools/perf/util/strbuf.c93
-rw-r--r--tools/perf/util/strbuf.h25
2 files changed, 82 insertions, 36 deletions
diff --git a/tools/perf/util/strbuf.c b/tools/perf/util/strbuf.c
index 8fb73295ec34..f95f682aa2b2 100644
--- a/tools/perf/util/strbuf.c
+++ b/tools/perf/util/strbuf.c
@@ -1,3 +1,4 @@
+#include "debug.h"
#include "cache.h"
#include <linux/kernel.h>
@@ -17,12 +18,13 @@ int prefixcmp(const char *str, const char *prefix)
*/
char strbuf_slopbuf[1];
-void strbuf_init(struct strbuf *sb, ssize_t hint)
+int strbuf_init(struct strbuf *sb, ssize_t hint)
{
sb->alloc = sb->len = 0;
sb->buf = strbuf_slopbuf;
if (hint)
- strbuf_grow(sb, hint);
+ return strbuf_grow(sb, hint);
+ return 0;
}
void strbuf_release(struct strbuf *sb)
@@ -42,67 +44,104 @@ char *strbuf_detach(struct strbuf *sb, size_t *sz)
return res;
}
-void strbuf_grow(struct strbuf *sb, size_t extra)
+int 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);
+ char *buf;
+ size_t nr = sb->len + extra + 1;
+
+ if (nr < sb->alloc)
+ return 0;
+
+ if (nr <= sb->len)
+ return -E2BIG;
+
+ if (alloc_nr(sb->alloc) > nr)
+ nr = alloc_nr(sb->alloc);
+
+ /*
+ * Note that sb->buf == strbuf_slopbuf if sb->alloc == 0, and it is
+ * a static variable. Thus we have to avoid passing it to realloc.
+ */
+ buf = realloc(sb->alloc ? sb->buf : NULL, nr * sizeof(*buf));
+ if (!buf)
+ return -ENOMEM;
+
+ sb->buf = buf;
+ sb->alloc = nr;
+ return 0;
}
-void strbuf_addch(struct strbuf *sb, int c)
+int strbuf_addch(struct strbuf *sb, int c)
{
- strbuf_grow(sb, 1);
+ int ret = strbuf_grow(sb, 1);
+ if (ret)
+ return ret;
+
sb->buf[sb->len++] = c;
sb->buf[sb->len] = '\0';
+ return 0;
}
-void strbuf_add(struct strbuf *sb, const void *data, size_t len)
+int strbuf_add(struct strbuf *sb, const void *data, size_t len)
{
- strbuf_grow(sb, len);
+ int ret = strbuf_grow(sb, len);
+ if (ret)
+ return ret;
+
memcpy(sb->buf + sb->len, data, len);
- strbuf_setlen(sb, sb->len + len);
+ return strbuf_setlen(sb, sb->len + len);
}
-static void strbuf_addv(struct strbuf *sb, const char *fmt, va_list ap)
+static int strbuf_addv(struct strbuf *sb, const char *fmt, va_list ap)
{
- int len;
+ int len, ret;
va_list ap_saved;
- if (!strbuf_avail(sb))
- strbuf_grow(sb, 64);
+ if (!strbuf_avail(sb)) {
+ ret = strbuf_grow(sb, 64);
+ if (ret)
+ return ret;
+ }
va_copy(ap_saved, ap);
len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
if (len < 0)
- die("your vsnprintf is broken");
+ return len;
if (len > strbuf_avail(sb)) {
- strbuf_grow(sb, len);
+ ret = strbuf_grow(sb, len);
+ if (ret)
+ return ret;
len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap_saved);
va_end(ap_saved);
if (len > strbuf_avail(sb)) {
- die("this should not happen, your vsnprintf is broken");
+ pr_debug("this should not happen, your vsnprintf is broken");
+ return -EINVAL;
}
}
- strbuf_setlen(sb, sb->len + len);
+ return strbuf_setlen(sb, sb->len + len);
}
-void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
+int strbuf_addf(struct strbuf *sb, const char *fmt, ...)
{
va_list ap;
+ int ret;
va_start(ap, fmt);
- strbuf_addv(sb, fmt, ap);
+ ret = strbuf_addv(sb, fmt, ap);
va_end(ap);
+ return ret;
}
ssize_t strbuf_read(struct strbuf *sb, int fd, ssize_t hint)
{
size_t oldlen = sb->len;
size_t oldalloc = sb->alloc;
+ int ret;
+
+ ret = strbuf_grow(sb, hint ? hint : 8192);
+ if (ret)
+ return ret;
- strbuf_grow(sb, hint ? hint : 8192);
for (;;) {
ssize_t cnt;
@@ -112,12 +151,14 @@ ssize_t strbuf_read(struct strbuf *sb, int fd, ssize_t hint)
strbuf_release(sb);
else
strbuf_setlen(sb, oldlen);
- return -1;
+ return cnt;
}
if (!cnt)
break;
sb->len += cnt;
- strbuf_grow(sb, 8192);
+ ret = strbuf_grow(sb, 8192);
+ if (ret)
+ return ret;
}
sb->buf[sb->len] = '\0';
diff --git a/tools/perf/util/strbuf.h b/tools/perf/util/strbuf.h
index ab9be0fbbd40..54b409297d4a 100644
--- a/tools/perf/util/strbuf.h
+++ b/tools/perf/util/strbuf.h
@@ -51,7 +51,7 @@ struct strbuf {
#define STRBUF_INIT { 0, 0, strbuf_slopbuf }
/*----- strbuf life cycle -----*/
-void strbuf_init(struct strbuf *buf, ssize_t hint);
+int strbuf_init(struct strbuf *buf, ssize_t hint);
void strbuf_release(struct strbuf *buf);
char *strbuf_detach(struct strbuf *buf, size_t *);
@@ -60,26 +60,31 @@ static inline ssize_t strbuf_avail(const struct strbuf *sb) {
return sb->alloc ? sb->alloc - sb->len - 1 : 0;
}
-void strbuf_grow(struct strbuf *buf, size_t);
+int strbuf_grow(struct strbuf *buf, size_t);
-static inline void strbuf_setlen(struct strbuf *sb, size_t len) {
- if (!sb->alloc)
- strbuf_grow(sb, 0);
+static inline int strbuf_setlen(struct strbuf *sb, size_t len) {
+ int ret;
+ if (!sb->alloc) {
+ ret = strbuf_grow(sb, 0);
+ if (ret)
+ return ret;
+ }
assert(len < sb->alloc);
sb->len = len;
sb->buf[len] = '\0';
+ return 0;
}
/*----- add data in your buffer -----*/
-void strbuf_addch(struct strbuf *sb, int c);
+int strbuf_addch(struct strbuf *sb, int c);
-void strbuf_add(struct strbuf *buf, const void *, size_t);
-static inline void strbuf_addstr(struct strbuf *sb, const char *s) {
- strbuf_add(sb, s, strlen(s));
+int strbuf_add(struct strbuf *buf, const void *, size_t);
+static inline int strbuf_addstr(struct strbuf *sb, const char *s) {
+ return strbuf_add(sb, s, strlen(s));
}
__attribute__((format(printf,2,3)))
-void strbuf_addf(struct strbuf *sb, const char *fmt, ...);
+int strbuf_addf(struct strbuf *sb, const char *fmt, ...);
/* XXX: if read fails, any partial read is undone */
ssize_t strbuf_read(struct strbuf *, int fd, ssize_t hint);