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authorJiri Olsa <jolsa@redhat.com>2013-12-03 14:09:22 +0100
committerArnaldo Carvalho de Melo <acme@redhat.com>2013-12-04 15:20:12 -0300
commitcef82c9f5a3deab94c1f1f02cfc25213844852ed (patch)
tree72bd6003cdb4692b964a5a5b05feb877a5c116bc /tools/perf/util/util.c
parent3d7c0144491bd8c21d53b43032274a85efdfe434 (diff)
perf tools: Add filename__read_str util function
Adding filename__read_str util function to read text file and return it in the char array. The interface is: int filename__read_str(const char *filename, char **buf, size_t *sizep) Returns 0/-1 if the read suceeded/fail respectively. buf - place to store the data pointer size - place to store data size v2 change: - better error handling suggested by Namhyung Kim. Signed-off-by: Jiri Olsa <jolsa@redhat.com> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/r/1386076182-14484-9-git-send-email-jolsa@redhat.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/util.c')
-rw-r--r--tools/perf/util/util.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index b1d5376b9dd..bae8756a4eb 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -6,6 +6,8 @@
#endif
#include <stdio.h>
#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
#include <linux/kernel.h>
/*
@@ -433,3 +435,50 @@ int filename__read_int(const char *filename, int *value)
close(fd);
return err;
}
+
+int filename__read_str(const char *filename, char **buf, size_t *sizep)
+{
+ size_t size = 0, alloc_size = 0;
+ void *bf = NULL, *nbf;
+ int fd, n, err = 0;
+
+ fd = open(filename, O_RDONLY);
+ if (fd < 0)
+ return -errno;
+
+ do {
+ if (size == alloc_size) {
+ alloc_size += BUFSIZ;
+ nbf = realloc(bf, alloc_size);
+ if (!nbf) {
+ err = -ENOMEM;
+ break;
+ }
+
+ bf = nbf;
+ }
+
+ n = read(fd, bf + size, alloc_size - size);
+ if (n < 0) {
+ if (size) {
+ pr_warning("read failed %d: %s\n",
+ errno, strerror(errno));
+ err = 0;
+ } else
+ err = -errno;
+
+ break;
+ }
+
+ size += n;
+ } while (n > 0);
+
+ if (!err) {
+ *sizep = size;
+ *buf = bf;
+ } else
+ free(bf);
+
+ close(fd);
+ return err;
+}