mirror of https://github.com/mpv-player/mpv
447 lines
9.6 KiB
C
447 lines
9.6 KiB
C
/*
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* command line and config file parser
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*/
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//#define DEBUG
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#include <stdlib.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <string.h>
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#define ERR_NOT_AN_OPTION -1
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#define ERR_MISSING_PARAM -2
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#define ERR_OUT_OF_RANGE -3
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#define ERR_FUNC_ERR -4
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#define COMMAND_LINE 0
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#define CONFIG_FILE 1
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#define MAX_RECURSION_DEPTH 8
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#ifdef DEBUG
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#include <assert.h>
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#endif
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#include "cfgparser.h"
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static struct config *config;
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static int nr_options; /* number of options in 'conf' */
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static int parser_mode; /* COMMAND_LINE or CONFIG_FILE */
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static int recursion_depth = 0;
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static int init_conf(struct config *conf, int mode)
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{
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#ifdef DEBUG
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assert(conf != NULL);
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#endif
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/* calculate the number of options in 'conf' */
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for (nr_options = 0; conf[nr_options].name != NULL; nr_options++)
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/* NOTHING */;
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config = conf;
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#ifdef DEBUG
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if (mode != COMMAND_LINE && mode != CONFIG_FILE) {
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printf("init_conf: wrong mode!\n");
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return -1;
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}
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#endif
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parser_mode = mode;
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return 1;
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}
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static int read_option(char *opt, char *param)
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{
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int i;
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long tmp_int;
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double tmp_float;
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int ret = -1;
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char *endptr;
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for (i = 0; i < nr_options; i++) {
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if (!strcasecmp(opt, config[i].name))
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break;
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}
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if (i == nr_options) {
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printf("invalid option:\n");
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ret = ERR_NOT_AN_OPTION;
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goto out;
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}
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if (config[i].flags & CONF_NOCFG && parser_mode == CONFIG_FILE) {
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printf("this option can only be used on command line:\n");
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ret = ERR_NOT_AN_OPTION;
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goto out;
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}
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if (config[i].flags & CONF_NOCMD && parser_mode == COMMAND_LINE) {
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printf("this option can only be used in config file:\n");
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ret = ERR_NOT_AN_OPTION;
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goto out;
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}
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switch (config[i].type) {
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case CONF_TYPE_FLAG:
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/* flags need a parameter in config file */
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if (parser_mode == CONFIG_FILE) {
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if (!strcasecmp(param, "yes") || /* any other language? */
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!strcasecmp(param, "ja") ||
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!strcasecmp(param, "si") ||
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!strcasecmp(param, "igen") ||
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!strcasecmp(param, "y") ||
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!strcasecmp(param, "i") ||
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!strcmp(param, "1"))
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*((int *) config[i].p) = config[i].max;
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else if (!strcasecmp(param, "no") ||
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!strcasecmp(param, "nein") ||
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!strcasecmp(param, "nicht") ||
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!strcasecmp(param, "nem") ||
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!strcasecmp(param, "n") ||
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!strcmp(param, "0"))
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*((int *) config[i].p) = config[i].min;
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else {
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printf("invalid parameter for flag:\n");
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ret = ERR_OUT_OF_RANGE;
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goto out;
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}
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ret = 1;
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} else { /* parser_mode == COMMAND_LINE */
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*((int *) config[i].p) = config[i].max;
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ret = 0;
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}
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break;
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case CONF_TYPE_INT:
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if (param == NULL)
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goto err_missing_param;
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tmp_int = strtol(param, &endptr, 0);
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if (*endptr) {
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printf("parameter must be an integer:\n");
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ret = ERR_OUT_OF_RANGE;
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goto out;
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}
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if (config[i].flags & CONF_MIN)
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if (tmp_int < config[i].min) {
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printf("parameter must be >= %d:\n", (int) config[i].min);
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ret = ERR_OUT_OF_RANGE;
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goto out;
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}
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if (config[i].flags & CONF_MAX)
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if (tmp_int > config[i].max) {
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printf("parameter must be <= %d:\n", (int) config[i].max);
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ret = ERR_OUT_OF_RANGE;
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goto out;
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}
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*((int *) config[i].p) = tmp_int;
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ret = 1;
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break;
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case CONF_TYPE_FLOAT:
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if (param == NULL)
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goto err_missing_param;
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tmp_float = strtod(param, &endptr);
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if (*endptr) {
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printf("parameter must be a floating point number:\n");
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ret = ERR_MISSING_PARAM;
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goto out;
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}
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if (config[i].flags & CONF_MIN)
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if (tmp_float < config[i].min) {
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printf("parameter must be >= %f:\n", config[i].min);
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ret = ERR_OUT_OF_RANGE;
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goto out;
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}
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if (config[i].flags & CONF_MAX)
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if (tmp_float > config[i].max) {
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printf("parameter must be <= %f:\n", config[i].max);
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ret = ERR_OUT_OF_RANGE;
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goto out;
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}
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*((float *) config[i].p) = tmp_float;
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ret = 1;
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break;
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case CONF_TYPE_STRING:
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if (param == NULL)
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goto err_missing_param;
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if (config[i].flags & CONF_MIN)
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if (strlen(param) < config[i].min) {
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printf("parameter must be >= %d chars:\n",
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(int) config[i].min);
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ret = ERR_OUT_OF_RANGE;
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goto out;
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}
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if (config[i].flags & CONF_MAX)
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if (strlen(param) > config[i].max) {
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printf("parameter must be <= %d chars:\n",
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(int) config[i].max);
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ret = ERR_OUT_OF_RANGE;
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goto out;
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}
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*((char **) config[i].p) = strdup(param);
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ret = 1;
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break;
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case CONF_TYPE_FUNC_PARAM:
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if (param == NULL)
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goto err_missing_param;
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if ((((cfg_func_param_t) config[i].p)(config + i, param)) < 0) {
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ret = ERR_FUNC_ERR;
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goto out;
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}
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ret = 1;
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break;
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case CONF_TYPE_FUNC:
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if ((((cfg_func_t) config[i].p)(config + i)) < 0) {
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ret = ERR_FUNC_ERR;
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goto out;
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}
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ret = 0;
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break;
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case CONF_TYPE_PRINT:
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printf("%s", (char *) config[i].p);
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exit(1);
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default:
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printf("picsaba\n");
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break;
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}
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out:
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return ret;
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err_missing_param:
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printf("missing parameter:\n");
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ret = ERR_MISSING_PARAM;
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goto out;
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}
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int parse_config_file(struct config *conf, char *conffile)
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{
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#define PRINT_LINENUM printf("%s(%d): ", conffile, line_num)
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#define MAX_LINE_LEN 1000
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#define MAX_OPT_LEN 100
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#define MAX_PARAM_LEN 100
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FILE *fp;
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char *line;
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char opt[MAX_OPT_LEN + 1];
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char param[MAX_PARAM_LEN + 1];
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char c; /* for the "" and '' check */
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int tmp;
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int line_num = 0;
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int line_pos; /* line pos */
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int opt_pos; /* opt pos */
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int param_pos; /* param pos */
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int ret = 1;
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#ifdef DEBUG
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assert(conffile != NULL);
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#endif
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if (++recursion_depth > MAX_RECURSION_DEPTH) {
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printf("too deep 'include'. check your configfiles\n");
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--recursion_depth;
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return -1;
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}
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printf("Reading config file: %s\n", conffile);
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if (init_conf(conf, CONFIG_FILE) == -1) {
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ret = -1;
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goto out;
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}
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if ((line = (char *) malloc(MAX_LINE_LEN + 1)) == NULL) {
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perror("parse_config_file: can't get memory for 'line'");
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ret = -1;
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goto out;
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}
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if ((fp = fopen(conffile, "r")) == NULL) {
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perror("parse_config_file: can't open filename");
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free(line);
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ret = 0;
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goto out;
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}
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while (fgets(line, MAX_LINE_LEN, fp)) {
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line_num++;
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line_pos = 0;
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/* skip whitespaces */
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while (isspace(line[line_pos]))
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++line_pos;
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/* EOL / comment */
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if (line[line_pos] == '\0' || line[line_pos] == '#')
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continue;
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/* read option. accept char if isalnum(char) */
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for (opt_pos = 0; isalnum(line[line_pos]); /* NOTHING */) {
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opt[opt_pos++] = line[line_pos++];
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if (opt_pos >= MAX_OPT_LEN) {
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PRINT_LINENUM;
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printf("too long option\n");
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ret = -1;
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continue;
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}
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}
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if (opt_pos == 0) {
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PRINT_LINENUM;
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printf("parse error\n");
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ret = -1;
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continue;
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}
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opt[opt_pos] = '\0';
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#ifdef DEBUG
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PRINT_LINENUM;
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printf("option: %s\n", opt);
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#endif
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/* skip whitespaces */
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while (isspace(line[line_pos]))
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++line_pos;
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/* check '=' */
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if (line[line_pos++] != '=') {
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PRINT_LINENUM;
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printf("option without parameter\n");
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ret = -1;
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continue;
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}
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/* whitespaces... */
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while (isspace(line[line_pos]))
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++line_pos;
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/* read the parameter */
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if (line[line_pos] == '"' || line[line_pos] == '\'') {
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c = line[line_pos];
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++line_pos;
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for (param_pos = 0; line[line_pos] != c; /* NOTHING */) {
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param[param_pos++] = line[line_pos++];
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if (param_pos >= MAX_PARAM_LEN) {
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PRINT_LINENUM;
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printf("too long parameter\n");
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ret = -1;
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continue;
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}
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}
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line_pos++; /* skip the closing " or ' */
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} else {
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for (param_pos = 0; isprint(line[line_pos]) && !isspace(line[line_pos])
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&& line[line_pos] != '#'; /* NOTHING */) {
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param[param_pos++] = line[line_pos++];
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if (param_pos >= MAX_PARAM_LEN) {
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PRINT_LINENUM;
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printf("too long parameter\n");
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ret = -1;
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continue;
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}
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}
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}
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param[param_pos] = '\0';
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/* did we read a parameter? */
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if (param_pos == 0) {
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PRINT_LINENUM;
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printf("option without parameter\n");
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ret = -1;
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continue;
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}
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#ifdef DEBUG
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PRINT_LINENUM;
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printf("parameter: %s\n", param);
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#endif
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/* now, check if we have some more chars on the line */
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/* whitespace... */
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while (isspace(line[line_pos]))
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++line_pos;
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/* EOL / comment */
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if (line[line_pos] != '\0' && line[line_pos] != '#') {
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PRINT_LINENUM;
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printf("extra characters on line: %s\n", line+line_pos);
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ret = -1;
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}
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tmp = read_option(opt, param);
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switch (tmp) {
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case ERR_NOT_AN_OPTION:
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case ERR_MISSING_PARAM:
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case ERR_OUT_OF_RANGE:
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case ERR_FUNC_ERR:
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PRINT_LINENUM;
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printf("%s\n", opt);
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ret = -1;
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continue;
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/* break */
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}
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}
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free(line);
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fclose(fp);
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out:
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--recursion_depth;
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return ret;
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}
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int parse_command_line(struct config *conf, int argc, char **argv, char **envp, char **filename)
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{
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int i;
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int found_filename = 0;
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int tmp;
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char *opt;
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#ifdef DEBUG
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assert(argv != NULL);
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assert(envp != NULL);
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assert(argc >= 1);
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#endif
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if (init_conf(conf, COMMAND_LINE) == -1)
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return -1;
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for (i = 1; i < argc; i++) {
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opt = argv[i];
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if (*opt != '-')
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goto not_an_option;
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/* remove trailing '-' */
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opt++;
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tmp = read_option(opt, argv[i + 1]);
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switch (tmp) {
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case ERR_NOT_AN_OPTION:
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not_an_option:
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/* opt is not an option -> treat it as a filename */
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if (found_filename) {
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/* we already have a filename */
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goto err_out;
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} else {
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found_filename = 1;
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*filename = argv[i];
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printf("parse_command_line: found filename: %s\n", *filename);
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continue; /* next option */
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}
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break;
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case ERR_MISSING_PARAM:
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case ERR_OUT_OF_RANGE:
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case ERR_FUNC_ERR:
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goto err_out;
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/* break; */
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}
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i += tmp; /* we already processed the params (if there was any) */
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}
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return found_filename;
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err_out:
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printf("parse_command_line: %s\n", argv[i]);
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return -1;
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}
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