mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-23 10:24:11 +07:00
9c10548c42
This came from the kernel lib/argv_split.c, so move it to tools/lib/argv_split.c, to get it closer to the kernel structure. We need to audit the usage of argv_split() to figure out if it is really necessary to do have one allocation per argv[] entry, looking at one of its users I guess that is not the case and we probably are even leaking those allocations by not using argv_free() judiciously, for later. With this we further remove stuff from tools/perf/util/, reducing the perf specific codebase and encouraging other tools/ code to use these routines so as to keep the style and constructs used with the kernel. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Link: https://lkml.kernel.org/n/tip-j479s1ive9h75w5lfg16jroz@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
101 lines
1.7 KiB
C
101 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Helper function for splitting a string into an argv-like array.
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/ctype.h>
|
|
#include <linux/string.h>
|
|
|
|
static const char *skip_arg(const char *cp)
|
|
{
|
|
while (*cp && !isspace(*cp))
|
|
cp++;
|
|
|
|
return cp;
|
|
}
|
|
|
|
static int count_argc(const char *str)
|
|
{
|
|
int count = 0;
|
|
|
|
while (*str) {
|
|
str = skip_spaces(str);
|
|
if (*str) {
|
|
count++;
|
|
str = skip_arg(str);
|
|
}
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
/**
|
|
* argv_free - free an argv
|
|
* @argv - the argument vector to be freed
|
|
*
|
|
* Frees an argv and the strings it points to.
|
|
*/
|
|
void argv_free(char **argv)
|
|
{
|
|
char **p;
|
|
for (p = argv; *p; p++) {
|
|
free(*p);
|
|
*p = NULL;
|
|
}
|
|
|
|
free(argv);
|
|
}
|
|
|
|
/**
|
|
* argv_split - split a string at whitespace, returning an argv
|
|
* @str: the string to be split
|
|
* @argcp: returned argument count
|
|
*
|
|
* Returns an array of pointers to strings which are split out from
|
|
* @str. This is performed by strictly splitting on white-space; no
|
|
* quote processing is performed. Multiple whitespace characters are
|
|
* considered to be a single argument separator. The returned array
|
|
* is always NULL-terminated. Returns NULL on memory allocation
|
|
* failure.
|
|
*/
|
|
char **argv_split(const char *str, int *argcp)
|
|
{
|
|
int argc = count_argc(str);
|
|
char **argv = calloc(argc + 1, sizeof(*argv));
|
|
char **argvp;
|
|
|
|
if (argv == NULL)
|
|
goto out;
|
|
|
|
if (argcp)
|
|
*argcp = argc;
|
|
|
|
argvp = argv;
|
|
|
|
while (*str) {
|
|
str = skip_spaces(str);
|
|
|
|
if (*str) {
|
|
const char *p = str;
|
|
char *t;
|
|
|
|
str = skip_arg(str);
|
|
|
|
t = strndup(p, str-p);
|
|
if (t == NULL)
|
|
goto fail;
|
|
*argvp++ = t;
|
|
}
|
|
}
|
|
*argvp = NULL;
|
|
|
|
out:
|
|
return argv;
|
|
|
|
fail:
|
|
argv_free(argv);
|
|
return NULL;
|
|
}
|