[mirror_ubuntu-artful-kernel.git] / tools / perf / util / config.c

/*
 * config.c
 *
 * Helper functions for parsing config items.
 * Originally copied from GIT source.
 *
 * Copyright (C) Linus Torvalds, 2005
 * Copyright (C) Johannes Schindelin, 2005
 *
 */
#include "util.h"
#include "cache.h"
#include "exec_cmd.h"

#define MAXNAME (256)

#define DEBUG_CACHE_DIR ".debug"


char buildid_dir[MAXPATHLEN]; /* root dir for buildid, binary cache */

static FILE *config_file;
static const char *config_file_name;
static int config_linenr;
static int config_file_eof;

static const char *config_exclusive_filename;

static int get_next_char(void)
{
	int c;
	FILE *f;

	c = '\n';
	if ((f = config_file) != NULL) {
		c = fgetc(f);
		if (c == '\r') {
			/* DOS like systems */
			c = fgetc(f);
			if (c != '\n') {
				ungetc(c, f);
				c = '\r';
			}
		}
		if (c == '\n')
			config_linenr++;
		if (c == EOF) {
			config_file_eof = 1;
			c = '\n';
		}
	}
	return c;
}

static char *parse_value(void)
{
	static char value[1024];
	int quote = 0, comment = 0, space = 0;
	size_t len = 0;

	for (;;) {
		int c = get_next_char();

		if (len >= sizeof(value) - 1)
			return NULL;
		if (c == '\n') {
			if (quote)
				return NULL;
			value[len] = 0;
			return value;
		}
		if (comment)
			continue;
		if (isspace(c) && !quote) {
			space = 1;
			continue;
		}
		if (!quote) {
			if (c == ';' || c == '#') {
				comment = 1;
				continue;
			}
		}
		if (space) {
			if (len)
				value[len++] = ' ';
			space = 0;
		}
		if (c == '\\') {
			c = get_next_char();
			switch (c) {
			case '\n':
				continue;
			case 't':
				c = '\t';
				break;
			case 'b':
				c = '\b';
				break;
			case 'n':
				c = '\n';
				break;
			/* Some characters escape as themselves */
			case '\\': case '"':
				break;
			/* Reject unknown escape sequences */
			default:
				return NULL;
			}
			value[len++] = c;
			continue;
		}
		if (c == '"') {
			quote = 1-quote;
			continue;
		}
		value[len++] = c;
	}
}

static inline int iskeychar(int c)
{
	return isalnum(c) || c == '-' || c == '_';
}

static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
{
	int c;
	char *value;

	/* Get the full name */
	for (;;) {
		c = get_next_char();
		if (config_file_eof)
			break;
		if (!iskeychar(c))
			break;
		name[len++] = c;
		if (len >= MAXNAME)
			return -1;
	}
	name[len] = 0;
	while (c == ' ' || c == '\t')
		c = get_next_char();

	value = NULL;
	if (c != '\n') {
		if (c != '=')
			return -1;
		value = parse_value();
		if (!value)
			return -1;
	}
	return fn(name, value, data);
}

static int get_extended_base_var(char *name, int baselen, int c)
{
	do {
		if (c == '\n')
			return -1;
		c = get_next_char();
	} while (isspace(c));

	/* We require the format to be '[base "extension"]' */
	if (c != '"')
		return -1;
	name[baselen++] = '.';

	for (;;) {
		int ch = get_next_char();

		if (ch == '\n')
			return -1;
		if (ch == '"')
			break;
		if (ch == '\\') {
			ch = get_next_char();
			if (ch == '\n')
				return -1;
		}
		name[baselen++] = ch;
		if (baselen > MAXNAME / 2)
			return -1;
	}

	/* Final ']' */
	if (get_next_char() != ']')
		return -1;
	return baselen;
}

static int get_base_var(char *name)
{
	int baselen = 0;

	for (;;) {
		int c = get_next_char();
		if (config_file_eof)
			return -1;
		if (c == ']')
			return baselen;
		if (isspace(c))
			return get_extended_base_var(name, baselen, c);
		if (!iskeychar(c) && c != '.')
			return -1;
		if (baselen > MAXNAME / 2)
			return -1;
		name[baselen++] = tolower(c);
	}
}

static int perf_parse_file(config_fn_t fn, void *data)
{
	int comment = 0;
	int baselen = 0;
	static char var[MAXNAME];

	/* U+FEFF Byte Order Mark in UTF8 */
	static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
	const unsigned char *bomptr = utf8_bom;

	for (;;) {
		int c = get_next_char();
		if (bomptr && *bomptr) {
			/* We are at the file beginning; skip UTF8-encoded BOM
			 * if present. Sane editors won't put this in on their
			 * own, but e.g. Windows Notepad will do it happily. */
			if ((unsigned char) c == *bomptr) {
				bomptr++;
				continue;
			} else {
				/* Do not tolerate partial BOM. */
				if (bomptr != utf8_bom)
					break;
				/* No BOM at file beginning. Cool. */
				bomptr = NULL;
			}
		}
		if (c == '\n') {
			if (config_file_eof)
				return 0;
			comment = 0;
			continue;
		}
		if (comment || isspace(c))
			continue;
		if (c == '#' || c == ';') {
			comment = 1;
			continue;
		}
		if (c == '[') {
			baselen = get_base_var(var);
			if (baselen <= 0)
				break;
			var[baselen++] = '.';
			var[baselen] = 0;
			continue;
		}
		if (!isalpha(c))
			break;
		var[baselen] = tolower(c);
		if (get_value(fn, data, var, baselen+1) < 0)
			break;
	}
	die("bad config file line %d in %s", config_linenr, config_file_name);
}

static int parse_unit_factor(const char *end, unsigned long *val)
{
	if (!*end)
		return 1;
	else if (!strcasecmp(end, "k")) {
		*val *= 1024;
		return 1;
	}
	else if (!strcasecmp(end, "m")) {
		*val *= 1024 * 1024;
		return 1;
	}
	else if (!strcasecmp(end, "g")) {
		*val *= 1024 * 1024 * 1024;
		return 1;
	}
	return 0;
}

static int perf_parse_long(const char *value, long *ret)
{
	if (value && *value) {
		char *end;
		long val = strtol(value, &end, 0);
		unsigned long factor = 1;
		if (!parse_unit_factor(end, &factor))
			return 0;
		*ret = val * factor;
		return 1;
	}
	return 0;
}

static void die_bad_config(const char *name)
{
	if (config_file_name)
		die("bad config value for '%s' in %s", name, config_file_name);
	die("bad config value for '%s'", name);
}

int perf_config_int(const char *name, const char *value)
{
	long ret = 0;
	if (!perf_parse_long(value, &ret))
		die_bad_config(name);
	return ret;
}

static int perf_config_bool_or_int(const char *name, const char *value, int *is_bool)
{
	*is_bool = 1;
	if (!value)
		return 1;
	if (!*value)
		return 0;
	if (!strcasecmp(value, "true") || !strcasecmp(value, "yes") || !strcasecmp(value, "on"))
		return 1;
	if (!strcasecmp(value, "false") || !strcasecmp(value, "no") || !strcasecmp(value, "off"))
		return 0;
	*is_bool = 0;
	return perf_config_int(name, value);
}

int perf_config_bool(const char *name, const char *value)
{
	int discard;
	return !!perf_config_bool_or_int(name, value, &discard);
}

const char *perf_config_dirname(const char *name, const char *value)
{
	if (!name)
		return NULL;
	return value;
}

static int perf_default_core_config(const char *var __used, const char *value __used)
{
	/* Add other config variables here. */
	return 0;
}

int perf_default_config(const char *var, const char *value, void *dummy __used)
{
	if (!prefixcmp(var, "core."))
		return perf_default_core_config(var, value);

	/* Add other config variables here. */
	return 0;
}

static int perf_config_from_file(config_fn_t fn, const char *filename, void *data)
{
	int ret;
	FILE *f = fopen(filename, "r");

	ret = -1;
	if (f) {
		config_file = f;
		config_file_name = filename;
		config_linenr = 1;
		config_file_eof = 0;
		ret = perf_parse_file(fn, data);
		fclose(f);
		config_file_name = NULL;
	}
	return ret;
}

static const char *perf_etc_perfconfig(void)
{
	static const char *system_wide;
	if (!system_wide)
		system_wide = system_path(ETC_PERFCONFIG);
	return system_wide;
}

static int perf_env_bool(const char *k, int def)
{
	const char *v = getenv(k);
	return v ? perf_config_bool(k, v) : def;
}

static int perf_config_system(void)
{
	return !perf_env_bool("PERF_CONFIG_NOSYSTEM", 0);
}

static int perf_config_global(void)
{
	return !perf_env_bool("PERF_CONFIG_NOGLOBAL", 0);
}

int perf_config(config_fn_t fn, void *data)
{
	int ret = 0, found = 0;
	const char *home = NULL;

	/* Setting $PERF_CONFIG makes perf read _only_ the given config file. */
	if (config_exclusive_filename)
		return perf_config_from_file(fn, config_exclusive_filename, data);
	if (perf_config_system() && !access(perf_etc_perfconfig(), R_OK)) {
		ret += perf_config_from_file(fn, perf_etc_perfconfig(),
					    data);
		found += 1;
	}

	home = getenv("HOME");
	if (perf_config_global() && home) {
		char *user_config = strdup(mkpath("%s/.perfconfig", home));
		struct stat st;

		if (user_config == NULL) {
			warning("Not enough memory to process %s/.perfconfig, "
				"ignoring it.", home);
			goto out;
		}

		if (stat(user_config, &st) < 0)
			goto out_free;

		if (st.st_uid && (st.st_uid != geteuid())) {
			warning("File %s not owned by current user or root, "
				"ignoring it.", user_config);
			goto out_free;
		}

		if (!st.st_size)
			goto out_free;

		ret += perf_config_from_file(fn, user_config, data);
		found += 1;
out_free:
		free(user_config);
	}
out:
	if (found == 0)
		return -1;
	return ret;
}

/*
 * Call this to report error for your variable that should not
 * get a boolean value (i.e. "[my] var" means "true").
 */
int config_error_nonbool(const char *var)
{
	return error("Missing value for '%s'", var);
}

struct buildid_dir_config {
	char *dir;
};

static int buildid_dir_command_config(const char *var, const char *value,
				      void *data)
{
	struct buildid_dir_config *c = data;
	const char *v;

	/* same dir for all commands */
	if (!prefixcmp(var, "buildid.") && !strcmp(var + 8, "dir")) {
		v = perf_config_dirname(var, value);
		if (!v)
			return -1;
		strncpy(c->dir, v, MAXPATHLEN-1);
		c->dir[MAXPATHLEN-1] = '\0';
	}
	return 0;
}

static void check_buildid_dir_config(void)
{
	struct buildid_dir_config c;
	c.dir = buildid_dir;
	perf_config(buildid_dir_command_config, &c);
}

void set_buildid_dir(void)
{
	buildid_dir[0] = '\0';

	/* try config file */
	check_buildid_dir_config();

	/* default to $HOME/.debug */
	if (buildid_dir[0] == '\0') {
		char *v = getenv("HOME");
		if (v) {
			snprintf(buildid_dir, MAXPATHLEN-1, "%s/%s",
				 v, DEBUG_CACHE_DIR);
		} else {
			strncpy(buildid_dir, DEBUG_CACHE_DIR, MAXPATHLEN-1);
		}
		buildid_dir[MAXPATHLEN-1] = '\0';
	}
	/* for communicating with external commands */
	setenv("PERF_BUILDID_DIR", buildid_dir, 1);
}
Commit	Line	Data
07800601	1	/*
5f9273d6 NK	2	* config.c
	3	*
	4	* Helper functions for parsing config items.
	5	* Originally copied from GIT source.
07800601 IM	6	*
	7	* Copyright (C) Linus Torvalds, 2005
	8	* Copyright (C) Johannes Schindelin, 2005
	9	*
	10	*/
	11	#include "util.h"
	12	#include "cache.h"
	13	#include "exec_cmd.h"
	14
	15	#define MAXNAME (256)
	16
45de34bb SE	17	#define DEBUG_CACHE_DIR ".debug"
	18
	19
	20	char buildid_dir[MAXPATHLEN]; /* root dir for buildid, binary cache */
	21
07800601 IM	22	static FILE *config_file;
	23	static const char *config_file_name;
	24	static int config_linenr;
	25	static int config_file_eof;
07800601	26
a41794cd	27	static const char *config_exclusive_filename;
07800601 IM	28
	29	static int get_next_char(void)
	30	{
	31	int c;
	32	FILE *f;
	33
	34	c = '\n';
	35	if ((f = config_file) != NULL) {
	36	c = fgetc(f);
	37	if (c == '\r') {
	38	/* DOS like systems */
	39	c = fgetc(f);
	40	if (c != '\n') {
	41	ungetc(c, f);
	42	c = '\r';
	43	}
	44	}
	45	if (c == '\n')
	46	config_linenr++;
	47	if (c == EOF) {
	48	config_file_eof = 1;
	49	c = '\n';
	50	}
	51	}
	52	return c;
	53	}
	54
	55	static char *parse_value(void)
	56	{
	57	static char value[1024];
f37a291c IM	58	int quote = 0, comment = 0, space = 0;
f37a291c IM	59	size_t len = 0;
07800601 IM	60
	61	for (;;) {
	62	int c = get_next_char();
f37a291c	63
07800601 IM	64	if (len >= sizeof(value) - 1)
	65	return NULL;
	66	if (c == '\n') {
	67	if (quote)
	68	return NULL;
	69	value[len] = 0;
	70	return value;
	71	}
	72	if (comment)
	73	continue;
	74	if (isspace(c) && !quote) {
	75	space = 1;
	76	continue;
	77	}
	78	if (!quote) {
	79	if (c == ';' \|\| c == '#') {
	80	comment = 1;
	81	continue;
	82	}
	83	}
	84	if (space) {
	85	if (len)
	86	value[len++] = ' ';
	87	space = 0;
	88	}
	89	if (c == '\\') {
	90	c = get_next_char();
	91	switch (c) {
	92	case '\n':
	93	continue;
	94	case 't':
	95	c = '\t';
	96	break;
	97	case 'b':
	98	c = '\b';
	99	break;
	100	case 'n':
	101	c = '\n';
	102	break;
	103	/* Some characters escape as themselves */
	104	case '\\': case '"':
	105	break;
	106	/* Reject unknown escape sequences */
	107	default:
	108	return NULL;
	109	}
	110	value[len++] = c;
	111	continue;
	112	}
	113	if (c == '"') {
	114	quote = 1-quote;
	115	continue;
	116	}
	117	value[len++] = c;
	118	}
	119	}
	120
	121	static inline int iskeychar(int c)
	122	{
8dc7c651	123	return isalnum(c) \|\| c == '-' \|\| c == '_';
07800601 IM	124	}
	125
	126	static int get_value(config_fn_t fn, void data, char name, unsigned int len)
	127	{
	128	int c;
	129	char *value;
	130
	131	/* Get the full name */
	132	for (;;) {
	133	c = get_next_char();
	134	if (config_file_eof)
	135	break;
	136	if (!iskeychar(c))
	137	break;
45de34bb	138	name[len++] = c;
07800601 IM	139	if (len >= MAXNAME)
	140	return -1;
	141	}
	142	name[len] = 0;
	143	while (c == ' ' \|\| c == '\t')
	144	c = get_next_char();
	145
	146	value = NULL;
	147	if (c != '\n') {
	148	if (c != '=')
	149	return -1;
	150	value = parse_value();
	151	if (!value)
	152	return -1;
	153	}
	154	return fn(name, value, data);
	155	}
	156
	157	static int get_extended_base_var(char *name, int baselen, int c)
	158	{
	159	do {
	160	if (c == '\n')
	161	return -1;
	162	c = get_next_char();
	163	} while (isspace(c));
	164
	165	/* We require the format to be '[base "extension"]' */
	166	if (c != '"')
	167	return -1;
	168	name[baselen++] = '.';
	169
	170	for (;;) {
83a0944f IM	171	int ch = get_next_char();
	172
	173	if (ch == '\n')
07800601	174	return -1;
83a0944f	175	if (ch == '"')
07800601	176	break;
83a0944f IM	177	if (ch == '\\') {
	178	ch = get_next_char();
	179	if (ch == '\n')
07800601 IM	180	return -1;
07800601 IM	181	}
83a0944f	182	name[baselen++] = ch;
07800601 IM	183	if (baselen > MAXNAME / 2)
	184	return -1;
	185	}
	186
	187	/* Final ']' */
	188	if (get_next_char() != ']')
	189	return -1;
	190	return baselen;
	191	}
	192
	193	static int get_base_var(char *name)
	194	{
	195	int baselen = 0;
	196
	197	for (;;) {
	198	int c = get_next_char();
	199	if (config_file_eof)
	200	return -1;
	201	if (c == ']')
	202	return baselen;
	203	if (isspace(c))
	204	return get_extended_base_var(name, baselen, c);
	205	if (!iskeychar(c) && c != '.')
	206	return -1;
	207	if (baselen > MAXNAME / 2)
	208	return -1;
	209	name[baselen++] = tolower(c);
	210	}
	211	}
	212
	213	static int perf_parse_file(config_fn_t fn, void *data)
	214	{
	215	int comment = 0;
	216	int baselen = 0;
	217	static char var[MAXNAME];
	218
	219	/* U+FEFF Byte Order Mark in UTF8 */
	220	static const unsigned char utf8_bom = (unsigned char ) "\xef\xbb\xbf";
	221	const unsigned char *bomptr = utf8_bom;
	222
	223	for (;;) {
	224	int c = get_next_char();
	225	if (bomptr && *bomptr) {
	226	/* We are at the file beginning; skip UTF8-encoded BOM
	227	* if present. Sane editors won't put this in on their
	228	* own, but e.g. Windows Notepad will do it happily. */
	229	if ((unsigned char) c == *bomptr) {
	230	bomptr++;
	231	continue;
	232	} else {
	233	/* Do not tolerate partial BOM. */
	234	if (bomptr != utf8_bom)
	235	break;
	236	/* No BOM at file beginning. Cool. */
	237	bomptr = NULL;
	238	}
	239	}
	240	if (c == '\n') {
	241	if (config_file_eof)
	242	return 0;
	243	comment = 0;
	244	continue;
	245	}
	246	if (comment \|\| isspace(c))
247	continue;
248	if (c == '#' \|\| c == ';') {
249	comment = 1;
250	continue;
251	}
252	if (c == '[') {
253	baselen = get_base_var(var);
254	if (baselen <= 0)
255	break;
256	var[baselen++] = '.';
257	var[baselen] = 0;
258	continue;
259	}
260	if (!isalpha(c))
261	break;
262	var[baselen] = tolower(c);
263	if (get_value(fn, data, var, baselen+1) < 0)
264	break;
265	}
266	die("bad config file line %d in %s", config_linenr, config_file_name);
267	}
268
269	static int parse_unit_factor(const char end, unsigned long val)
270	{
271	if (!*end)
272	return 1;
273	else if (!strcasecmp(end, "k")) {
274	val = 1024;
275	return 1;
276	}
277	else if (!strcasecmp(end, "m")) {
278	val = 1024 * 1024;
279	return 1;
280	}
281	else if (!strcasecmp(end, "g")) {
282	val = 1024 * 1024 * 1024;
283	return 1;
284	}
285	return 0;
286	}
287
288	static int perf_parse_long(const char value, long ret)
289	{
290	if (value && *value) {
291	char *end;
292	long val = strtol(value, &end, 0);
293	unsigned long factor = 1;
294	if (!parse_unit_factor(end, &factor))
295	return 0;
296	ret = val factor;
297	return 1;
298	}
299	return 0;
300	}
301
07800601 IM	302	static void die_bad_config(const char *name)
	303	{
	304	if (config_file_name)
	305	die("bad config value for '%s' in %s", name, config_file_name);
	306	die("bad config value for '%s'", name);
	307	}
	308
	309	int perf_config_int(const char name, const char value)
	310	{
	311	long ret = 0;
	312	if (!perf_parse_long(value, &ret))
	313	die_bad_config(name);
	314	return ret;
	315	}
	316
a41794cd	317	static int perf_config_bool_or_int(const char name, const char value, int *is_bool)
07800601 IM	318	{
	319	*is_bool = 1;
	320	if (!value)
	321	return 1;
	322	if (!*value)
	323	return 0;
	324	if (!strcasecmp(value, "true") \|\| !strcasecmp(value, "yes") \|\| !strcasecmp(value, "on"))
	325	return 1;
	326	if (!strcasecmp(value, "false") \|\| !strcasecmp(value, "no") \|\| !strcasecmp(value, "off"))
	327	return 0;
	328	*is_bool = 0;
	329	return perf_config_int(name, value);
	330	}
	331
	332	int perf_config_bool(const char name, const char value)
	333	{
	334	int discard;
	335	return !!perf_config_bool_or_int(name, value, &discard);
	336	}
	337
45de34bb SE	338	const char perf_config_dirname(const char name, const char *value)
	339	{
	340	if (!name)
	341	return NULL;
	342	return value;
	343	}
	344
f37a291c	345	static int perf_default_core_config(const char var __used, const char value __used)
07800601	346	{
395cf969	347	/* Add other config variables here. */
07800601 IM	348	return 0;
	349	}
	350
f37a291c	351	int perf_default_config(const char var, const char value, void *dummy __used)
07800601 IM	352	{
	353	if (!prefixcmp(var, "core."))
	354	return perf_default_core_config(var, value);
	355
395cf969	356	/* Add other config variables here. */
07800601 IM	357	return 0;
	358	}
	359
a41794cd	360	static int perf_config_from_file(config_fn_t fn, const char filename, void data)
07800601 IM	361	{
	362	int ret;
	363	FILE *f = fopen(filename, "r");
	364
	365	ret = -1;
	366	if (f) {
	367	config_file = f;
	368	config_file_name = filename;
	369	config_linenr = 1;
	370	config_file_eof = 0;
	371	ret = perf_parse_file(fn, data);
	372	fclose(f);
	373	config_file_name = NULL;
	374	}
	375	return ret;
	376	}
	377
a41794cd	378	static const char *perf_etc_perfconfig(void)
07800601 IM	379	{
	380	static const char *system_wide;
	381	if (!system_wide)
	382	system_wide = system_path(ETC_PERFCONFIG);
	383	return system_wide;
	384	}
	385
	386	static int perf_env_bool(const char *k, int def)
	387	{
	388	const char *v = getenv(k);
	389	return v ? perf_config_bool(k, v) : def;
	390	}
	391
a41794cd	392	static int perf_config_system(void)
07800601 IM	393	{
	394	return !perf_env_bool("PERF_CONFIG_NOSYSTEM", 0);
	395	}
	396
a41794cd	397	static int perf_config_global(void)
07800601 IM	398	{
	399	return !perf_env_bool("PERF_CONFIG_NOGLOBAL", 0);
	400	}
	401
	402	int perf_config(config_fn_t fn, void *data)
	403	{
	404	int ret = 0, found = 0;
07800601 IM	405	const char *home = NULL;
	406
	407	/* Setting $PERF_CONFIG makes perf read _only_ the given config file. */
	408	if (config_exclusive_filename)
	409	return perf_config_from_file(fn, config_exclusive_filename, data);
	410	if (perf_config_system() && !access(perf_etc_perfconfig(), R_OK)) {
	411	ret += perf_config_from_file(fn, perf_etc_perfconfig(),
	412	data);
	413	found += 1;
	414	}
	415
	416	home = getenv("HOME");
	417	if (perf_config_global() && home) {
	418	char *user_config = strdup(mkpath("%s/.perfconfig", home));
069e3725 ACM	419	struct stat st;
	420
	421	if (user_config == NULL) {
	422	warning("Not enough memory to process %s/.perfconfig, "
	423	"ignoring it.", home);
	424	goto out;
	425	}
	426
	427	if (stat(user_config, &st) < 0)
	428	goto out_free;
	429
	430	if (st.st_uid && (st.st_uid != geteuid())) {
	431	warning("File %s not owned by current user or root, "
	432	"ignoring it.", user_config);
	433	goto out_free;
07800601	434	}
069e3725 ACM	435
	436	if (!st.st_size)
	437	goto out_free;
	438
	439	ret += perf_config_from_file(fn, user_config, data);
	440	found += 1;
	441	out_free:
07800601 IM	442	free(user_config);
07800601 IM	443	}
069e3725	444	out:
07800601 IM	445	if (found == 0)
	446	return -1;
	447	return ret;
	448	}
	449
07800601 IM	450	/*
	451	* Call this to report error for your variable that should not
	452	* get a boolean value (i.e. "[my] var" means "true").
	453	*/
	454	int config_error_nonbool(const char *var)
	455	{
	456	return error("Missing value for '%s'", var);
	457	}
45de34bb SE	458
	459	struct buildid_dir_config {
	460	char *dir;
	461	};
	462
	463	static int buildid_dir_command_config(const char var, const char value,
	464	void *data)
	465	{
	466	struct buildid_dir_config *c = data;
	467	const char *v;
	468
	469	/* same dir for all commands */
	470	if (!prefixcmp(var, "buildid.") && !strcmp(var + 8, "dir")) {
	471	v = perf_config_dirname(var, value);
	472	if (!v)
	473	return -1;
	474	strncpy(c->dir, v, MAXPATHLEN-1);
	475	c->dir[MAXPATHLEN-1] = '\0';
	476	}
	477	return 0;
	478	}
	479
	480	static void check_buildid_dir_config(void)
	481	{
	482	struct buildid_dir_config c;
	483	c.dir = buildid_dir;
	484	perf_config(buildid_dir_command_config, &c);
	485	}
	486
	487	void set_buildid_dir(void)
	488	{
	489	buildid_dir[0] = '\0';
	490
	491	/* try config file */
	492	check_buildid_dir_config();
	493
	494	/* default to $HOME/.debug */
	495	if (buildid_dir[0] == '\0') {
	496	char *v = getenv("HOME");
	497	if (v) {
	498	snprintf(buildid_dir, MAXPATHLEN-1, "%s/%s",
	499	v, DEBUG_CACHE_DIR);
	500	} else {
	501	strncpy(buildid_dir, DEBUG_CACHE_DIR, MAXPATHLEN-1);
	502	}
	503	buildid_dir[MAXPATHLEN-1] = '\0';
	504	}
	505	/* for communicating with external commands */
	506	setenv("PERF_BUILDID_DIR", buildid_dir, 1);
	507	}