508 lines
9.7 KiB
C
508 lines
9.7 KiB
C
/*
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* config.c
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*
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* Helper functions for parsing config items.
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* Originally copied from GIT source.
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*
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* Copyright (C) Linus Torvalds, 2005
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* Copyright (C) Johannes Schindelin, 2005
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*
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*/
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#include "util.h"
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#include "cache.h"
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#include "exec_cmd.h"
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#define MAXNAME (256)
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#define DEBUG_CACHE_DIR ".debug"
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char buildid_dir[MAXPATHLEN]; /* root dir for buildid, binary cache */
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static FILE *config_file;
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static const char *config_file_name;
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static int config_linenr;
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static int config_file_eof;
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static const char *config_exclusive_filename;
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static int get_next_char(void)
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{
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int c;
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FILE *f;
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c = '\n';
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if ((f = config_file) != NULL) {
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c = fgetc(f);
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if (c == '\r') {
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/* DOS like systems */
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c = fgetc(f);
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if (c != '\n') {
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ungetc(c, f);
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c = '\r';
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}
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}
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if (c == '\n')
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config_linenr++;
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if (c == EOF) {
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config_file_eof = 1;
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c = '\n';
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}
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}
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return c;
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}
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static char *parse_value(void)
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{
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static char value[1024];
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int quote = 0, comment = 0, space = 0;
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size_t len = 0;
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for (;;) {
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int c = get_next_char();
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if (len >= sizeof(value) - 1)
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return NULL;
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if (c == '\n') {
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if (quote)
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return NULL;
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value[len] = 0;
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return value;
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}
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if (comment)
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continue;
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if (isspace(c) && !quote) {
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space = 1;
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continue;
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}
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if (!quote) {
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if (c == ';' || c == '#') {
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comment = 1;
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continue;
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}
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}
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if (space) {
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if (len)
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value[len++] = ' ';
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space = 0;
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}
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if (c == '\\') {
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c = get_next_char();
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switch (c) {
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case '\n':
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continue;
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case 't':
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c = '\t';
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break;
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case 'b':
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c = '\b';
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break;
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case 'n':
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c = '\n';
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break;
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/* Some characters escape as themselves */
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case '\\': case '"':
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break;
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/* Reject unknown escape sequences */
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default:
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return NULL;
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}
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value[len++] = c;
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continue;
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}
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if (c == '"') {
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quote = 1-quote;
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continue;
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}
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value[len++] = c;
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}
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}
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static inline int iskeychar(int c)
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{
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return isalnum(c) || c == '-';
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}
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static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
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{
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int c;
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char *value;
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/* Get the full name */
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for (;;) {
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c = get_next_char();
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if (config_file_eof)
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break;
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if (!iskeychar(c))
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break;
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name[len++] = c;
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if (len >= MAXNAME)
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return -1;
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}
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name[len] = 0;
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while (c == ' ' || c == '\t')
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c = get_next_char();
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value = NULL;
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if (c != '\n') {
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if (c != '=')
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return -1;
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value = parse_value();
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if (!value)
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return -1;
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}
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return fn(name, value, data);
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}
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static int get_extended_base_var(char *name, int baselen, int c)
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{
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do {
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if (c == '\n')
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return -1;
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c = get_next_char();
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} while (isspace(c));
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/* We require the format to be '[base "extension"]' */
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if (c != '"')
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return -1;
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name[baselen++] = '.';
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for (;;) {
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int ch = get_next_char();
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if (ch == '\n')
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return -1;
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if (ch == '"')
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break;
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if (ch == '\\') {
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ch = get_next_char();
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if (ch == '\n')
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return -1;
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}
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name[baselen++] = ch;
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if (baselen > MAXNAME / 2)
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return -1;
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}
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/* Final ']' */
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if (get_next_char() != ']')
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return -1;
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return baselen;
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}
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static int get_base_var(char *name)
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{
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int baselen = 0;
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for (;;) {
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int c = get_next_char();
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if (config_file_eof)
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return -1;
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if (c == ']')
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return baselen;
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if (isspace(c))
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return get_extended_base_var(name, baselen, c);
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if (!iskeychar(c) && c != '.')
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return -1;
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if (baselen > MAXNAME / 2)
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return -1;
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name[baselen++] = tolower(c);
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}
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}
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static int perf_parse_file(config_fn_t fn, void *data)
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{
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int comment = 0;
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int baselen = 0;
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static char var[MAXNAME];
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/* U+FEFF Byte Order Mark in UTF8 */
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static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
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const unsigned char *bomptr = utf8_bom;
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for (;;) {
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int c = get_next_char();
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if (bomptr && *bomptr) {
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/* We are at the file beginning; skip UTF8-encoded BOM
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* if present. Sane editors won't put this in on their
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* own, but e.g. Windows Notepad will do it happily. */
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if ((unsigned char) c == *bomptr) {
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bomptr++;
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continue;
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} else {
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/* Do not tolerate partial BOM. */
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if (bomptr != utf8_bom)
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break;
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/* No BOM at file beginning. Cool. */
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bomptr = NULL;
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}
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}
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if (c == '\n') {
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if (config_file_eof)
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return 0;
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comment = 0;
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continue;
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}
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if (comment || isspace(c))
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continue;
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if (c == '#' || c == ';') {
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comment = 1;
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continue;
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}
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if (c == '[') {
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baselen = get_base_var(var);
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if (baselen <= 0)
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break;
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var[baselen++] = '.';
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var[baselen] = 0;
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continue;
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}
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if (!isalpha(c))
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break;
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var[baselen] = tolower(c);
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if (get_value(fn, data, var, baselen+1) < 0)
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break;
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}
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die("bad config file line %d in %s", config_linenr, config_file_name);
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}
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static int parse_unit_factor(const char *end, unsigned long *val)
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{
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if (!*end)
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return 1;
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else if (!strcasecmp(end, "k")) {
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*val *= 1024;
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return 1;
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}
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else if (!strcasecmp(end, "m")) {
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*val *= 1024 * 1024;
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return 1;
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}
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else if (!strcasecmp(end, "g")) {
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*val *= 1024 * 1024 * 1024;
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return 1;
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}
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return 0;
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}
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static int perf_parse_long(const char *value, long *ret)
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{
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if (value && *value) {
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char *end;
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long val = strtol(value, &end, 0);
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unsigned long factor = 1;
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if (!parse_unit_factor(end, &factor))
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return 0;
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*ret = val * factor;
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return 1;
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}
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return 0;
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}
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static void die_bad_config(const char *name)
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{
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if (config_file_name)
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die("bad config value for '%s' in %s", name, config_file_name);
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die("bad config value for '%s'", name);
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}
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int perf_config_int(const char *name, const char *value)
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{
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long ret = 0;
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if (!perf_parse_long(value, &ret))
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die_bad_config(name);
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return ret;
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}
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static int perf_config_bool_or_int(const char *name, const char *value, int *is_bool)
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{
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*is_bool = 1;
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if (!value)
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return 1;
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if (!*value)
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return 0;
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if (!strcasecmp(value, "true") || !strcasecmp(value, "yes") || !strcasecmp(value, "on"))
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return 1;
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if (!strcasecmp(value, "false") || !strcasecmp(value, "no") || !strcasecmp(value, "off"))
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return 0;
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*is_bool = 0;
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return perf_config_int(name, value);
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}
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int perf_config_bool(const char *name, const char *value)
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{
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int discard;
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return !!perf_config_bool_or_int(name, value, &discard);
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}
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const char *perf_config_dirname(const char *name, const char *value)
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{
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if (!name)
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return NULL;
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return value;
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}
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static int perf_default_core_config(const char *var __used, const char *value __used)
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{
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/* Add other config variables here. */
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return 0;
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}
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int perf_default_config(const char *var, const char *value, void *dummy __used)
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{
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if (!prefixcmp(var, "core."))
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return perf_default_core_config(var, value);
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/* Add other config variables here. */
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return 0;
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}
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static int perf_config_from_file(config_fn_t fn, const char *filename, void *data)
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{
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int ret;
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FILE *f = fopen(filename, "r");
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ret = -1;
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if (f) {
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config_file = f;
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config_file_name = filename;
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config_linenr = 1;
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config_file_eof = 0;
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ret = perf_parse_file(fn, data);
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fclose(f);
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config_file_name = NULL;
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}
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return ret;
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}
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static const char *perf_etc_perfconfig(void)
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{
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static const char *system_wide;
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if (!system_wide)
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system_wide = system_path(ETC_PERFCONFIG);
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return system_wide;
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}
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static int perf_env_bool(const char *k, int def)
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{
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const char *v = getenv(k);
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return v ? perf_config_bool(k, v) : def;
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}
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static int perf_config_system(void)
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{
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return !perf_env_bool("PERF_CONFIG_NOSYSTEM", 0);
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}
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static int perf_config_global(void)
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{
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return !perf_env_bool("PERF_CONFIG_NOGLOBAL", 0);
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}
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int perf_config(config_fn_t fn, void *data)
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{
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int ret = 0, found = 0;
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const char *home = NULL;
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/* Setting $PERF_CONFIG makes perf read _only_ the given config file. */
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if (config_exclusive_filename)
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return perf_config_from_file(fn, config_exclusive_filename, data);
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if (perf_config_system() && !access(perf_etc_perfconfig(), R_OK)) {
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ret += perf_config_from_file(fn, perf_etc_perfconfig(),
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data);
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found += 1;
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}
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home = getenv("HOME");
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if (perf_config_global() && home) {
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char *user_config = strdup(mkpath("%s/.perfconfig", home));
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struct stat st;
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if (user_config == NULL) {
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warning("Not enough memory to process %s/.perfconfig, "
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"ignoring it.", home);
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goto out;
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}
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if (stat(user_config, &st) < 0)
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goto out_free;
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if (st.st_uid && (st.st_uid != geteuid())) {
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warning("File %s not owned by current user or root, "
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"ignoring it.", user_config);
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goto out_free;
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}
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if (!st.st_size)
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goto out_free;
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ret += perf_config_from_file(fn, user_config, data);
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found += 1;
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out_free:
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free(user_config);
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}
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out:
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if (found == 0)
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return -1;
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return ret;
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}
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/*
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* Call this to report error for your variable that should not
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* get a boolean value (i.e. "[my] var" means "true").
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*/
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int config_error_nonbool(const char *var)
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{
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return error("Missing value for '%s'", var);
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}
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struct buildid_dir_config {
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char *dir;
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};
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static int buildid_dir_command_config(const char *var, const char *value,
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void *data)
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{
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struct buildid_dir_config *c = data;
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const char *v;
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/* same dir for all commands */
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if (!prefixcmp(var, "buildid.") && !strcmp(var + 8, "dir")) {
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v = perf_config_dirname(var, value);
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if (!v)
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return -1;
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strncpy(c->dir, v, MAXPATHLEN-1);
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c->dir[MAXPATHLEN-1] = '\0';
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}
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return 0;
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}
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static void check_buildid_dir_config(void)
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{
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struct buildid_dir_config c;
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c.dir = buildid_dir;
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perf_config(buildid_dir_command_config, &c);
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}
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void set_buildid_dir(void)
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{
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buildid_dir[0] = '\0';
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/* try config file */
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check_buildid_dir_config();
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/* default to $HOME/.debug */
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if (buildid_dir[0] == '\0') {
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char *v = getenv("HOME");
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if (v) {
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snprintf(buildid_dir, MAXPATHLEN-1, "%s/%s",
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v, DEBUG_CACHE_DIR);
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} else {
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strncpy(buildid_dir, DEBUG_CACHE_DIR, MAXPATHLEN-1);
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}
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buildid_dir[MAXPATHLEN-1] = '\0';
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}
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/* for communicating with external commands */
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setenv("PERF_BUILDID_DIR", buildid_dir, 1);
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}
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