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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>
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2 changed files with 50 additions and 0 deletions
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@ -6,6 +6,8 @@
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <linux/kernel.h>
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/*
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@ -433,3 +435,50 @@ int filename__read_int(const char *filename, int *value)
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close(fd);
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return err;
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}
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int filename__read_str(const char *filename, char **buf, size_t *sizep)
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{
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size_t size = 0, alloc_size = 0;
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void *bf = NULL, *nbf;
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int fd, n, err = 0;
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fd = open(filename, O_RDONLY);
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if (fd < 0)
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return -errno;
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do {
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if (size == alloc_size) {
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alloc_size += BUFSIZ;
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nbf = realloc(bf, alloc_size);
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if (!nbf) {
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err = -ENOMEM;
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break;
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}
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bf = nbf;
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}
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n = read(fd, bf + size, alloc_size - size);
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if (n < 0) {
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if (size) {
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pr_warning("read failed %d: %s\n",
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errno, strerror(errno));
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err = 0;
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} else
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err = -errno;
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break;
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}
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size += n;
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} while (n > 0);
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if (!err) {
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*sizep = size;
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*buf = bf;
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} else
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free(bf);
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close(fd);
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return err;
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}
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@ -308,4 +308,5 @@ char *get_srcline(struct dso *dso, unsigned long addr);
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void free_srcline(char *srcline);
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int filename__read_int(const char *filename, int *value);
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int filename__read_str(const char *filename, char **buf, size_t *sizep);
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#endif /* GIT_COMPAT_UTIL_H */
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