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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>
100 lines
1.7 KiB
C
100 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Helper function for splitting a string into an argv-like array.
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*/
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#include <stdlib.h>
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#include <linux/kernel.h>
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#include <linux/ctype.h>
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#include <linux/string.h>
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static const char *skip_arg(const char *cp)
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{
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while (*cp && !isspace(*cp))
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cp++;
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return cp;
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}
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static int count_argc(const char *str)
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{
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int count = 0;
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while (*str) {
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str = skip_spaces(str);
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if (*str) {
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count++;
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str = skip_arg(str);
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}
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}
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return count;
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}
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/**
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* argv_free - free an argv
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* @argv - the argument vector to be freed
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*
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* Frees an argv and the strings it points to.
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*/
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void argv_free(char **argv)
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{
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char **p;
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for (p = argv; *p; p++) {
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free(*p);
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*p = NULL;
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}
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free(argv);
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}
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/**
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* argv_split - split a string at whitespace, returning an argv
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* @str: the string to be split
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* @argcp: returned argument count
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*
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* Returns an array of pointers to strings which are split out from
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* @str. This is performed by strictly splitting on white-space; no
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* quote processing is performed. Multiple whitespace characters are
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* considered to be a single argument separator. The returned array
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* is always NULL-terminated. Returns NULL on memory allocation
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* failure.
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*/
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char **argv_split(const char *str, int *argcp)
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{
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int argc = count_argc(str);
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char **argv = calloc(argc + 1, sizeof(*argv));
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char **argvp;
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if (argv == NULL)
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goto out;
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if (argcp)
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*argcp = argc;
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argvp = argv;
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while (*str) {
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str = skip_spaces(str);
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if (*str) {
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const char *p = str;
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char *t;
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str = skip_arg(str);
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t = strndup(p, str-p);
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if (t == NULL)
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goto fail;
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*argvp++ = t;
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}
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}
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*argvp = NULL;
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out:
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return argv;
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fail:
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argv_free(argv);
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return NULL;
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}
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