[deliverable/linux.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 <subcmd/exec-cmd.h>
#include "util/hist.h"  /* perf_hist_config */
#include "util/llvm-utils.h"   /* perf_llvm_config */

#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;

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 line, 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);

		/*
		 * The get_value function might or might not reach the '\n',
		 * so saving the current line number for error reporting.
		 */
		line = config_linenr;
		if (get_value(fn, data, var, baselen+1) < 0) {
			config_linenr = line;
			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_llong(const char *value, long long *ret)
{
	if (value && *value) {
		char *end;
		long long val = strtoll(value, &end, 0);
		unsigned long factor = 1;

		if (!parse_unit_factor(end, &factor))
			return 0;
		*ret = val * factor;
		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);
}

u64 perf_config_u64(const char *name, const char *value)
{
	long long ret = 0;

	if (!perf_parse_llong(value, &ret))
		die_bad_config(name);
	return (u64) ret;
}

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 __maybe_unused,
				    const char *value __maybe_unused)
{
	/* Add other config variables here. */
	return 0;
}

static int perf_ui_config(const char *var, const char *value)
{
	/* Add other config variables here. */
	if (!strcmp(var, "ui.show-headers")) {
		symbol_conf.show_hist_headers = perf_config_bool(var, value);
		return 0;
	}
	return 0;
}

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

	if (!prefixcmp(var, "hist."))
		return perf_hist_config(var, value);

	if (!prefixcmp(var, "ui."))
		return perf_ui_config(var, value);

	if (!prefixcmp(var, "call-graph."))
		return perf_callchain_config(var, value);

	if (!prefixcmp(var, "llvm."))
		return perf_llvm_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;
}

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 (!strcmp(var, "buildid.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(const char *dir)
{
	if (dir)
		scnprintf(buildid_dir, MAXPATHLEN-1, "%s", dir);

	/* try config file */
	if (buildid_dir[0] == '\0')
		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"
4b6ab94e	13	#include <subcmd/exec-cmd.h>
0b93da17	14	#include "util/hist.h" /* perf_hist_config */
aa61fd05	15	#include "util/llvm-utils.h" /* perf_llvm_config */
07800601 IM	16
	17	#define MAXNAME (256)
	18
45de34bb SE	19	#define DEBUG_CACHE_DIR ".debug"
	20
	21
	22	char buildid_dir[MAXPATHLEN]; /* root dir for buildid, binary cache */
	23
07800601 IM	24	static FILE *config_file;
	25	static const char *config_file_name;
	26	static int config_linenr;
	27	static int config_file_eof;
07800601	28
c7ac2417	29	const char *config_exclusive_filename;
07800601 IM	30
	31	static int get_next_char(void)
	32	{
	33	int c;
	34	FILE *f;
	35
	36	c = '\n';
	37	if ((f = config_file) != NULL) {
	38	c = fgetc(f);
	39	if (c == '\r') {
	40	/* DOS like systems */
	41	c = fgetc(f);
	42	if (c != '\n') {
	43	ungetc(c, f);
	44	c = '\r';
	45	}
	46	}
	47	if (c == '\n')
	48	config_linenr++;
	49	if (c == EOF) {
	50	config_file_eof = 1;
	51	c = '\n';
	52	}
	53	}
	54	return c;
	55	}
	56
	57	static char *parse_value(void)
	58	{
	59	static char value[1024];
f37a291c IM	60	int quote = 0, comment = 0, space = 0;
f37a291c IM	61	size_t len = 0;
07800601 IM	62
	63	for (;;) {
	64	int c = get_next_char();
f37a291c	65
07800601 IM	66	if (len >= sizeof(value) - 1)
	67	return NULL;
	68	if (c == '\n') {
	69	if (quote)
	70	return NULL;
	71	value[len] = 0;
	72	return value;
	73	}
	74	if (comment)
	75	continue;
	76	if (isspace(c) && !quote) {
	77	space = 1;
	78	continue;
	79	}
	80	if (!quote) {
	81	if (c == ';' \|\| c == '#') {
	82	comment = 1;
	83	continue;
	84	}
	85	}
	86	if (space) {
	87	if (len)
	88	value[len++] = ' ';
	89	space = 0;
	90	}
	91	if (c == '\\') {
	92	c = get_next_char();
	93	switch (c) {
	94	case '\n':
	95	continue;
	96	case 't':
	97	c = '\t';
	98	break;
	99	case 'b':
	100	c = '\b';
	101	break;
	102	case 'n':
	103	c = '\n';
	104	break;
	105	/* Some characters escape as themselves */
	106	case '\\': case '"':
	107	break;
	108	/* Reject unknown escape sequences */
	109	default:
	110	return NULL;
	111	}
	112	value[len++] = c;
	113	continue;
	114	}
	115	if (c == '"') {
	116	quote = 1-quote;
	117	continue;
	118	}
	119	value[len++] = c;
	120	}
	121	}
	122
	123	static inline int iskeychar(int c)
	124	{
8dc7c651	125	return isalnum(c) \|\| c == '-' \|\| c == '_';
07800601 IM	126	}
	127
	128	static int get_value(config_fn_t fn, void data, char name, unsigned int len)
	129	{
	130	int c;
	131	char *value;
	132
	133	/* Get the full name */
	134	for (;;) {
	135	c = get_next_char();
	136	if (config_file_eof)
	137	break;
	138	if (!iskeychar(c))
	139	break;
45de34bb	140	name[len++] = c;
07800601 IM	141	if (len >= MAXNAME)
	142	return -1;
	143	}
	144	name[len] = 0;
	145	while (c == ' ' \|\| c == '\t')
	146	c = get_next_char();
	147
	148	value = NULL;
	149	if (c != '\n') {
	150	if (c != '=')
	151	return -1;
	152	value = parse_value();
	153	if (!value)
	154	return -1;
	155	}
	156	return fn(name, value, data);
	157	}
	158
	159	static int get_extended_base_var(char *name, int baselen, int c)
	160	{
	161	do {
	162	if (c == '\n')
	163	return -1;
	164	c = get_next_char();
	165	} while (isspace(c));
	166
	167	/* We require the format to be '[base "extension"]' */
	168	if (c != '"')
	169	return -1;
	170	name[baselen++] = '.';
	171
	172	for (;;) {
83a0944f IM	173	int ch = get_next_char();
	174
	175	if (ch == '\n')
07800601	176	return -1;
83a0944f	177	if (ch == '"')
07800601	178	break;
83a0944f IM	179	if (ch == '\\') {
	180	ch = get_next_char();
	181	if (ch == '\n')
07800601 IM	182	return -1;
07800601 IM	183	}
83a0944f	184	name[baselen++] = ch;
07800601 IM	185	if (baselen > MAXNAME / 2)
	186	return -1;
	187	}
	188
	189	/* Final ']' */
	190	if (get_next_char() != ']')
	191	return -1;
	192	return baselen;
	193	}
	194
	195	static int get_base_var(char *name)
	196	{
	197	int baselen = 0;
	198
	199	for (;;) {
	200	int c = get_next_char();
	201	if (config_file_eof)
	202	return -1;
	203	if (c == ']')
	204	return baselen;
	205	if (isspace(c))
	206	return get_extended_base_var(name, baselen, c);
	207	if (!iskeychar(c) && c != '.')
	208	return -1;
	209	if (baselen > MAXNAME / 2)
	210	return -1;
	211	name[baselen++] = tolower(c);
	212	}
	213	}
	214
	215	static int perf_parse_file(config_fn_t fn, void *data)
	216	{
	217	int comment = 0;
	218	int baselen = 0;
	219	static char var[MAXNAME];
	220
	221	/* U+FEFF Byte Order Mark in UTF8 */
	222	static const unsigned char utf8_bom = (unsigned char ) "\xef\xbb\xbf";
	223	const unsigned char *bomptr = utf8_bom;
	224
	225	for (;;) {
49757c9c JO	226	int line, c = get_next_char();
49757c9c JO	227
07800601 IM	228	if (bomptr && *bomptr) {
	229	/* We are at the file beginning; skip UTF8-encoded BOM
	230	* if present. Sane editors won't put this in on their
	231	* own, but e.g. Windows Notepad will do it happily. */
	232	if ((unsigned char) c == *bomptr) {
	233	bomptr++;
	234	continue;
	235	} else {
	236	/* Do not tolerate partial BOM. */
	237	if (bomptr != utf8_bom)
	238	break;
	239	/* No BOM at file beginning. Cool. */
	240	bomptr = NULL;
	241	}
	242	}
	243	if (c == '\n') {
	244	if (config_file_eof)
	245	return 0;
	246	comment = 0;
	247	continue;
	248	}
	249	if (comment \|\| isspace(c))
	250	continue;
	251	if (c == '#' \|\| c == ';') {
	252	comment = 1;
	253	continue;
	254	}
	255	if (c == '[') {
	256	baselen = get_base_var(var);
	257	if (baselen <= 0)
	258	break;
	259	var[baselen++] = '.';
	260	var[baselen] = 0;
	261	continue;
	262	}
	263	if (!isalpha(c))
	264	break;
	265	var[baselen] = tolower(c);
49757c9c JO	266
	267	/*
	268	* The get_value function might or might not reach the '\n',
	269	* so saving the current line number for error reporting.
	270	*/
	271	line = config_linenr;
	272	if (get_value(fn, data, var, baselen+1) < 0) {
	273	config_linenr = line;
07800601	274	break;
49757c9c	275	}
07800601 IM	276	}
	277	die("bad config file line %d in %s", config_linenr, config_file_name);
	278	}
	279
	280	static int parse_unit_factor(const char end, unsigned long val)
	281	{
	282	if (!*end)
	283	return 1;
	284	else if (!strcasecmp(end, "k")) {
	285	val = 1024;
	286	return 1;
	287	}
	288	else if (!strcasecmp(end, "m")) {
	289	val = 1024 * 1024;
	290	return 1;
	291	}
	292	else if (!strcasecmp(end, "g")) {
	293	val = 1024 * 1024 * 1024;
	294	return 1;
	295	}
	296	return 0;
	297	}
	298
94c0655f JO	299	static int perf_parse_llong(const char value, long long ret)
	300	{
	301	if (value && *value) {
	302	char *end;
	303	long long val = strtoll(value, &end, 0);
	304	unsigned long factor = 1;
	305
	306	if (!parse_unit_factor(end, &factor))
	307	return 0;
	308	ret = val factor;
	309	return 1;
	310	}
	311	return 0;
	312	}
	313
07800601 IM	314	static int perf_parse_long(const char value, long ret)
	315	{
	316	if (value && *value) {
	317	char *end;
	318	long val = strtol(value, &end, 0);
	319	unsigned long factor = 1;
	320	if (!parse_unit_factor(end, &factor))
	321	return 0;
	322	ret = val factor;
	323	return 1;
	324	}
	325	return 0;
	326	}
	327
07800601 IM	328	static void die_bad_config(const char *name)
	329	{
	330	if (config_file_name)
	331	die("bad config value for '%s' in %s", name, config_file_name);
	332	die("bad config value for '%s'", name);
	333	}
	334
94c0655f JO	335	u64 perf_config_u64(const char name, const char value)
	336	{
	337	long long ret = 0;
	338
	339	if (!perf_parse_llong(value, &ret))
	340	die_bad_config(name);
	341	return (u64) ret;
	342	}
	343
07800601 IM	344	int perf_config_int(const char name, const char value)
	345	{
	346	long ret = 0;
	347	if (!perf_parse_long(value, &ret))
	348	die_bad_config(name);
	349	return ret;
	350	}
	351
a41794cd	352	static int perf_config_bool_or_int(const char name, const char value, int *is_bool)
07800601 IM	353	{
	354	*is_bool = 1;
	355	if (!value)
	356	return 1;
	357	if (!*value)
	358	return 0;
	359	if (!strcasecmp(value, "true") \|\| !strcasecmp(value, "yes") \|\| !strcasecmp(value, "on"))
	360	return 1;
	361	if (!strcasecmp(value, "false") \|\| !strcasecmp(value, "no") \|\| !strcasecmp(value, "off"))
	362	return 0;
	363	*is_bool = 0;
	364	return perf_config_int(name, value);
	365	}
	366
	367	int perf_config_bool(const char name, const char value)
	368	{
	369	int discard;
	370	return !!perf_config_bool_or_int(name, value, &discard);
	371	}
	372
45de34bb SE	373	const char perf_config_dirname(const char name, const char *value)
	374	{
	375	if (!name)
	376	return NULL;
	377	return value;
	378	}
	379
1d037ca1 IT	380	static int perf_default_core_config(const char *var __maybe_unused,
1d037ca1 IT	381	const char *value __maybe_unused)
07800601	382	{
395cf969	383	/* Add other config variables here. */
07800601 IM	384	return 0;
	385	}
	386
c8302367 JO	387	static int perf_ui_config(const char var, const char value)
	388	{
	389	/* Add other config variables here. */
	390	if (!strcmp(var, "ui.show-headers")) {
	391	symbol_conf.show_hist_headers = perf_config_bool(var, value);
	392	return 0;
	393	}
	394	return 0;
	395	}
	396
1d037ca1 IT	397	int perf_default_config(const char var, const char value,
1d037ca1 IT	398	void *dummy __maybe_unused)
07800601 IM	399	{
	400	if (!prefixcmp(var, "core."))
	401	return perf_default_core_config(var, value);
	402
0b93da17 NK	403	if (!prefixcmp(var, "hist."))
	404	return perf_hist_config(var, value);
	405
c8302367 JO	406	if (!prefixcmp(var, "ui."))
	407	return perf_ui_config(var, value);
	408
2b9240ca NK	409	if (!prefixcmp(var, "call-graph."))
	410	return perf_callchain_config(var, value);
	411
aa61fd05 WN	412	if (!prefixcmp(var, "llvm."))
	413	return perf_llvm_config(var, value);
	414
395cf969	415	/* Add other config variables here. */
07800601 IM	416	return 0;
	417	}
	418
a41794cd	419	static int perf_config_from_file(config_fn_t fn, const char filename, void data)
07800601 IM	420	{
	421	int ret;
	422	FILE *f = fopen(filename, "r");
	423
	424	ret = -1;
	425	if (f) {
	426	config_file = f;
	427	config_file_name = filename;
	428	config_linenr = 1;
	429	config_file_eof = 0;
	430	ret = perf_parse_file(fn, data);
	431	fclose(f);
	432	config_file_name = NULL;
	433	}
	434	return ret;
	435	}
	436
c7ac2417	437	const char *perf_etc_perfconfig(void)
07800601 IM	438	{
	439	static const char *system_wide;
	440	if (!system_wide)
	441	system_wide = system_path(ETC_PERFCONFIG);
	442	return system_wide;
	443	}
	444
	445	static int perf_env_bool(const char *k, int def)
	446	{
	447	const char *v = getenv(k);
	448	return v ? perf_config_bool(k, v) : def;
	449	}
	450
a41794cd	451	static int perf_config_system(void)
07800601 IM	452	{
	453	return !perf_env_bool("PERF_CONFIG_NOSYSTEM", 0);
	454	}
	455
a41794cd	456	static int perf_config_global(void)
07800601 IM	457	{
	458	return !perf_env_bool("PERF_CONFIG_NOGLOBAL", 0);
	459	}
	460
	461	int perf_config(config_fn_t fn, void *data)
	462	{
	463	int ret = 0, found = 0;
07800601 IM	464	const char *home = NULL;
	465
	466	/* Setting $PERF_CONFIG makes perf read _only_ the given config file. */
	467	if (config_exclusive_filename)
	468	return perf_config_from_file(fn, config_exclusive_filename, data);
	469	if (perf_config_system() && !access(perf_etc_perfconfig(), R_OK)) {
	470	ret += perf_config_from_file(fn, perf_etc_perfconfig(),
	471	data);
	472	found += 1;
	473	}
	474
	475	home = getenv("HOME");
	476	if (perf_config_global() && home) {
	477	char *user_config = strdup(mkpath("%s/.perfconfig", home));
069e3725 ACM	478	struct stat st;
	479
	480	if (user_config == NULL) {
	481	warning("Not enough memory to process %s/.perfconfig, "
	482	"ignoring it.", home);
	483	goto out;
	484	}
	485
	486	if (stat(user_config, &st) < 0)
	487	goto out_free;
	488
	489	if (st.st_uid && (st.st_uid != geteuid())) {
	490	warning("File %s not owned by current user or root, "
	491	"ignoring it.", user_config);
	492	goto out_free;
07800601	493	}
069e3725 ACM	494
	495	if (!st.st_size)
	496	goto out_free;
	497
	498	ret += perf_config_from_file(fn, user_config, data);
	499	found += 1;
	500	out_free:
07800601 IM	501	free(user_config);
07800601 IM	502	}
069e3725	503	out:
07800601 IM	504	if (found == 0)
	505	return -1;
	506	return ret;
	507	}
	508
07800601 IM	509	/*
	510	* Call this to report error for your variable that should not
	511	* get a boolean value (i.e. "[my] var" means "true").
	512	*/
	513	int config_error_nonbool(const char *var)
	514	{
	515	return error("Missing value for '%s'", var);
	516	}
45de34bb SE	517
	518	struct buildid_dir_config {
	519	char *dir;
	520	};
	521
	522	static int buildid_dir_command_config(const char var, const char value,
	523	void *data)
	524	{
	525	struct buildid_dir_config *c = data;
	526	const char *v;
	527
	528	/* same dir for all commands */
cfd31d85	529	if (!strcmp(var, "buildid.dir")) {
45de34bb SE	530	v = perf_config_dirname(var, value);
	531	if (!v)
	532	return -1;
	533	strncpy(c->dir, v, MAXPATHLEN-1);
	534	c->dir[MAXPATHLEN-1] = '\0';
	535	}
	536	return 0;
	537	}
	538
	539	static void check_buildid_dir_config(void)
	540	{
	541	struct buildid_dir_config c;
	542	c.dir = buildid_dir;
	543	perf_config(buildid_dir_command_config, &c);
	544	}
	545
99ce8e9f	546	void set_buildid_dir(const char *dir)
45de34bb	547	{
99ce8e9f JO	548	if (dir)
99ce8e9f JO	549	scnprintf(buildid_dir, MAXPATHLEN-1, "%s", dir);
45de34bb SE	550
45de34bb SE	551	/* try config file */
99ce8e9f JO	552	if (buildid_dir[0] == '\0')
99ce8e9f JO	553	check_buildid_dir_config();
45de34bb SE	554
	555	/* default to $HOME/.debug */
	556	if (buildid_dir[0] == '\0') {
	557	char *v = getenv("HOME");
	558	if (v) {
	559	snprintf(buildid_dir, MAXPATHLEN-1, "%s/%s",
	560	v, DEBUG_CACHE_DIR);
	561	} else {
	562	strncpy(buildid_dir, DEBUG_CACHE_DIR, MAXPATHLEN-1);
	563	}
	564	buildid_dir[MAXPATHLEN-1] = '\0';
	565	}
	566	/* for communicating with external commands */
	567	setenv("PERF_BUILDID_DIR", buildid_dir, 1);
	568	}