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>

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);