Resolved several minor errors in prepare_config() and made some additional improvements.
Earlier, the risk of file stream that was not closed. Misuse of strncpy, and the use of strncmp with strlen that makes it pointless.
I also check that sscanf has been successful, otherwise continue to the next line. And minimized the use of magic numbers.
This was found using a static code analysis program called cppcheck.
Signed-off-by: Rickard Strandqvist <[email protected]>
---
tools/power/cpupower/bench/parse.c | 39 +++++++++++++++++++-----------------
1 file changed, 21 insertions(+), 18 deletions(-)
diff --git a/tools/power/cpupower/bench/parse.c b/tools/power/cpupower/bench/parse.c
index 543bba1..f503fb5 100644
--- a/tools/power/cpupower/bench/parse.c
+++ b/tools/power/cpupower/bench/parse.c
@@ -158,14 +158,15 @@ struct config *prepare_default_config()
int prepare_config(const char *path, struct config *config)
{
size_t len = 0;
- char *opt, *val, *line = NULL;
- FILE *configfile = fopen(path, "r");
+ char opt[16], val[32], *line = NULL;
+ FILE *configfile;
if (config == NULL) {
fprintf(stderr, "error: config is NULL\n");
return 1;
}
+ configfile = fopen(path, "r");
if (configfile == NULL) {
perror("fopen");
fprintf(stderr, "error: unable to read configfile\n");
@@ -174,52 +175,54 @@ int prepare_config(const char *path, struct config *config)
}
while (getline(&line, &len, configfile) != -1) {
- if (line[0] == '#' || line[0] == ' ')
+ if (line[0] == '#' || line[0] == ' ' || line[0] == '\n')
continue;
- sscanf(line, "%as = %as", &opt, &val);
+ if (sscanf(line, "%14s = %30s", opt, val) < 2)
+ continue;
dprintf("parsing: %s -> %s\n", opt, val);
- if (strncmp("sleep", opt, strlen(opt)) == 0)
+ if (strcmp("sleep", opt) == 0)
sscanf(val, "%li", &config->sleep);
- else if (strncmp("load", opt, strlen(opt)) == 0)
+ else if (strcmp("load", opt) == 0)
sscanf(val, "%li", &config->load);
- else if (strncmp("load_step", opt, strlen(opt)) == 0)
+ else if (strcmp("load_step", opt) == 0)
sscanf(val, "%li", &config->load_step);
- else if (strncmp("sleep_step", opt, strlen(opt)) == 0)
+ else if (strcmp("sleep_step", opt) == 0)
sscanf(val, "%li", &config->sleep_step);
- else if (strncmp("cycles", opt, strlen(opt)) == 0)
+ else if (strcmp("cycles", opt) == 0)
sscanf(val, "%u", &config->cycles);
- else if (strncmp("rounds", opt, strlen(opt)) == 0)
+ else if (strcmp("rounds", opt) == 0)
sscanf(val, "%u", &config->rounds);
- else if (strncmp("verbose", opt, strlen(opt)) == 0)
+ else if (strcmp("verbose", opt) == 0)
sscanf(val, "%u", &config->verbose);
- else if (strncmp("output", opt, strlen(opt)) == 0)
+ else if (strcmp("output", opt) == 0)
config->output = prepare_output(val);
- else if (strncmp("cpu", opt, strlen(opt)) == 0)
+ else if (strcmp("cpu", opt) == 0)
sscanf(val, "%u", &config->cpu);
- else if (strncmp("governor", opt, 14) == 0)
- strncpy(config->governor, val, 14);
+ else if (strcmp("governor", opt) == 0) {
+ strncpy(config->governor, val,
+ sizeof(config->governor));
+ config->governor[sizeof(config->governor) - 1] = '\0';
+ }
- else if (strncmp("priority", opt, strlen(opt)) == 0) {
+ else if (strcmp("priority", opt) == 0) {
if (string_to_prio(val) != SCHED_ERR)
config->prio = string_to_prio(val);
}
}
free(line);
- free(opt);
- free(val);
return 0;
}
--
1.7.10.4