t_parseconfig.c

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>

#define WS      " \t\r\n"
#define LIBHAMMER_MAXCFGOPTS	6
#define TOSTR(n) #n

enum libhammer_cfglist {
	snapshots_cfg,
	prune_cfg,
	rebalance_cfg,
	dedup_cfg,
	reblock_cfg,
	recopy_cfg
};

struct libhammer_pfs_confopt {
        char *optname;
        char *args[3];
};

typedef struct libhammer_pfs_config {
	struct libhammer_pfs_confopt opts[LIBHAMMER_MAXCFGOPTS];
} *libhammer_pfs_config_t;

static int
str2idx(const char *opt)
{
	if (strcmp("snapshots", opt) == 0)
		return snapshots_cfg;
	else if (strcmp("prune", opt) == 0)
		return prune_cfg;
	else if (strcmp("rebalance", opt) == 0)
		return rebalance_cfg;
	else if (strcmp("dedup", opt) == 0)
		return dedup_cfg;
	else if (strcmp("reblock", opt) == 0)
		return reblock_cfg;
	else if (strcmp("recopy", opt) == 0)
		return recopy_cfg;
	else
		return -1;
}

int
parse_config_file(char *text, libhammer_pfs_config_t config)
{
	char *line, *tok, *tok2;
	int i;
	int idx;

	while ((line = strsep(&text, "\n")) != NULL) {
		if (line[0] != '#') {
			tok = strsep(&line, WS);
			idx = str2idx(tok);
			config->opts[idx].optname = tok;
			/*
			 * Attempt to extract all the arguments for the
			 * current option being parsed. Since there can
			 * be multiple spaces between the option and its
			 * arguments, multiple strsep() calls are needed
			 * when that is detected.
			 */
			for (i = 0; i < 3; i++) {
				tok2 = strsep(&line, WS);
				while(tok2 && tok2[0] == '\0')
					tok2 = strsep(&line, WS);
				if (!tok2)
					break;
				config->opts[idx].args[i] = tok2;
			}
		}
	}

	return 0;
}

void
print_config(libhammer_pfs_config_t config)
{
	int i, j;

	for (i = 0; i < LIBHAMMER_MAXCFGOPTS; i++) {
		fprintf(stdout, "_%s ", config->opts[i].optname);
		for (j = 0; j < 3; j++)
			fprintf(stdout, "_%s ", config->opts[i].args[j]);
		printf("\n");
	}
}

int
main(void)
{
	libhammer_pfs_config_t config;
	FILE *fp;
	char text[1024];

	config = malloc(sizeof(*config));
	fp = fopen("./config.txt", "r");
	fread(text, 1, 1023, fp);

	parse_config_file(text, config);
	print_config(config);

	free(config);
	fclose(fp);

	return 0;
}