[deliverable/linux.git] / tools / perf / util / path.c

/*
 * I'm tired of doing "vsnprintf()" etc just to open a
 * file, so here's a "return static buffer with printf"
 * interface for paths.
 *
 * It's obviously not thread-safe. Sue me. But it's quite
 * useful for doing things like
 *
 *   f = open(mkpath("%s/%s.perf", base, name), O_RDONLY);
 *
 * which is what it's designed for.
 */
#include "cache.h"
#include "util.h"
#include <limits.h>

static char bad_path[] = "/bad-path/";
/*
 * One hack:
 */
static char *get_pathname(void)
{
	static char pathname_array[4][PATH_MAX];
	static int idx;

	return pathname_array[3 & ++idx];
}

static char *cleanup_path(char *path)
{
	/* Clean it up */
	if (!memcmp(path, "./", 2)) {
		path += 2;
		while (*path == '/')
			path++;
	}
	return path;
}

char *mkpath(const char *fmt, ...)
{
	va_list args;
	unsigned len;
	char *pathname = get_pathname();

	va_start(args, fmt);
	len = vsnprintf(pathname, PATH_MAX, fmt, args);
	va_end(args);
	if (len >= PATH_MAX)
		return bad_path;
	return cleanup_path(pathname);
}
Commit	Line	Data
07800601 IM	1	/*
	2	* I'm tired of doing "vsnprintf()" etc just to open a
	3	* file, so here's a "return static buffer with printf"
	4	* interface for paths.
	5	*
	6	* It's obviously not thread-safe. Sue me. But it's quite
	7	* useful for doing things like
	8	*
	9	* f = open(mkpath("%s/%s.perf", base, name), O_RDONLY);
	10	*
	11	* which is what it's designed for.
	12	*/
	13	#include "cache.h"
175729fc ACM	14	#include "util.h"
175729fc ACM	15	#include <limits.h>
07800601 IM	16
	17	static char bad_path[] = "/bad-path/";
	18	/*
814b3f51	19	* One hack:
07800601	20	*/
07800601 IM	21	static char *get_pathname(void)
	22	{
	23	static char pathname_array[4][PATH_MAX];
83a0944f IM	24	static int idx;
	25
	26	return pathname_array[3 & ++idx];
07800601 IM	27	}
	28
	29	static char cleanup_path(char path)
	30	{
	31	/* Clean it up */
	32	if (!memcmp(path, "./", 2)) {
	33	path += 2;
	34	while (*path == '/')
	35	path++;
	36	}
	37	return path;
	38	}
	39
07800601 IM	40	char mkpath(const char fmt, ...)
	41	{
	42	va_list args;
	43	unsigned len;
	44	char *pathname = get_pathname();
	45
	46	va_start(args, fmt);
	47	len = vsnprintf(pathname, PATH_MAX, fmt, args);
	48	va_end(args);
	49	if (len >= PATH_MAX)
	50	return bad_path;
	51	return cleanup_path(pathname);
	52	}