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 <jo...@redhat.com>
Cc: Corey Ashford <cjash...@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweis...@gmail.com>
Cc: Ingo Molnar <mi...@elte.hu>
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Paul Mackerras <pau...@samba.org>
Cc: Peter Zijlstra <a.p.zijls...@chello.nl>
Cc: Arnaldo Carvalho de Melo <a...@ghostprotocols.net>
Cc: Steven Rostedt <rost...@goodmis.org>
Cc: David Ahern <dsah...@gmail.com>
---
tools/perf/util/util.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
tools/perf/util/util.h | 1 +
2 files changed, 50 insertions(+)
diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index b1d5376..bae8756 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;
+}
diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
index ce0f73d..adb39f2 100644
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -308,4 +308,5 @@ char *get_srcline(struct dso *dso, unsigned long addr);
void free_srcline(char *srcline);
int filename__read_int(const char *filename, int *value);
+int filename__read_str(const char *filename, char **buf, size_t *sizep);
#endif /* GIT_COMPAT_UTIL_H */
--
1.8.3.1
--
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