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-rw-r--r--src/liboptions/options.c275
1 files changed, 275 insertions, 0 deletions
diff --git a/src/liboptions/options.c b/src/liboptions/options.c
new file mode 100644
index 0000000..4b8f062
--- /dev/null
+++ b/src/liboptions/options.c
@@ -0,0 +1,275 @@
+/* command line options and config file parsing
+ *
+ * (C) 2018 by Andreas Eversberg <jolly@eversberg.eu>
+ * All Rights Reserved
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include "options.h"
+#include "../libdebug/debug.h"
+
+typedef struct option {
+ struct option *next;
+ int short_option;
+ const char *long_option;
+ int parameter_count;
+} option_t;
+
+static option_t *option_head = NULL;
+static option_t **option_tailp = &option_head;
+static int first_option = 1;
+
+void option_add(int short_option, const char *long_option, int parameter_count)
+{
+ option_t *option;
+
+ /* check if option already exists */
+ for (option = option_head; option; option = option->next) {
+ if (option->short_option == short_option
+ || !strcmp(option->long_option, long_option)) {
+ PDEBUG(DOPTIONS, DEBUG_ERROR, "Option '%s' added twice, please fix!\n", option->long_option);
+ abort();
+ }
+ }
+
+ option = calloc(1, sizeof(*option));
+ if (!option) {
+ PDEBUG(DOPTIONS, DEBUG_ERROR, "No mem!\n");
+ abort();
+ }
+
+ option->short_option = short_option;
+ option->long_option = long_option;
+ option->parameter_count = parameter_count;
+ *option_tailp = option;
+ option_tailp = &(option->next);
+}
+
+int options_config_file(const char *config_file, int (*handle_options)(int short_option, int argi, char *argv[]))
+{
+ static const char *home;
+ char config[256];
+ FILE *fp;
+ char buffer[256], opt[256], param[256], *p, *argv[16];
+ char params[1024];
+ int line;
+ int rc = 1;
+ int i, j, quote;
+ option_t *option;
+
+ /* open config file */
+ home = getenv("HOME");
+ if (home == NULL)
+ return 1;
+ sprintf(config, "%s/%s", home, config_file + 2);
+
+ fp = fopen(config, "r");
+ if (!fp) {
+ PDEBUG(DOPTIONS, DEBUG_INFO, "Config file '%s' seems not to exist, using command line options only.\n", config);
+ return 1;
+ }
+
+ /* parse config file */
+ line = 0;
+ while((fgets(buffer, sizeof(buffer), fp))) {
+ line++;
+ /* prevent buffer overflow */
+ buffer[sizeof(buffer) - 1] = '\0';
+ /* cut away new-line and white spaces */
+ while (buffer[0] && buffer[strlen(buffer) - 1] <= ' ')
+ buffer[strlen(buffer) - 1] = '\0';
+ p = buffer;
+ /* remove white spaces in front of first keyword */
+ while (*p > '\0' && *p <= ' ')
+ p++;
+ /* ignore '#' lines */
+ if (*p == '#')
+ continue;
+ /* get option form line */
+ i = 0;
+ while (*p > ' ')
+ opt[i++] = *p++;
+ opt[i] = '\0';
+ if (opt[0] == '\0')
+ continue;
+ /* skip white spaces behind option */
+ while (*p > '\0' && *p <= ' ')
+ p++;
+ /* get param from line */
+ params[0] = '\0';
+ i = 0;
+ while (*p) {
+ /* copy parameter */
+ j = 0;
+ quote = 0;
+ while (*p) {
+ /* escape allows all following characters */
+ if (*p == '\\') {
+ p++;
+ if (*p)
+ param[j++] = *p++;
+ continue;
+ }
+ /* no quote, check for them or break on white space */
+ if (quote == 0) {
+ if (*p == '\'') {
+ quote = 1;
+ p++;
+ continue;
+ }
+ if (*p == '\"') {
+ quote = 2;
+ p++;
+ continue;
+ }
+ if (*p <= ' ')
+ break;
+ }
+ /* single quote, check for unquote */
+ if (quote == 1 && *p == '\'') {
+ quote = 0;
+ p++;
+ continue;
+ }
+ /* double quote, check for unquote */
+ if (quote == 2 && *p == '\"') {
+ quote = 0;
+ p++;
+ continue;
+ }
+ /* copy character */
+ param[j++] = *p++;
+ }
+ param[j] = '\0';
+ argv[i] = strdup(param);
+ sprintf(strchr(params, '\0'), " '%s'", param);
+ /* skip white spaces behind option */
+ while (*p > '\0' && *p <= ' ')
+ p++;
+ i++;
+ }
+ /* search option */
+ for (option = option_head; option; option = option->next) {
+ if (opt[0] == option->short_option && opt[1] == '\0') {
+ PDEBUG(DOPTIONS, DEBUG_INFO, "Config file option '%s' ('%s'), parameter%s\n", opt, option->long_option, params);
+ break;
+ }
+ if (!strcmp(opt, option->long_option)) {
+ PDEBUG(DOPTIONS, DEBUG_INFO, "Config file option '%s', parameter%s\n", opt, params);
+ break;
+ }
+ }
+ if (!option) {
+ PDEBUG(DOPTIONS, DEBUG_ERROR, "Given option '%s' in config file '%s' at line %d is not a valid option, use '-h' for help!\n", opt, config_file, line);
+ rc = -EINVAL;
+ goto done;
+ }
+ if (option->parameter_count != i) {
+ PDEBUG(DOPTIONS, DEBUG_ERROR, "Given option '%s' in config file '%s' at line %d requires %d parameter(s), use '-h' for help!\n", opt, config_file, line, option->parameter_count);
+ return -EINVAL;
+ }
+ rc = handle_options(option->short_option, 0, argv);
+ if (rc <= 0)
+ goto done;
+ first_option = 0;
+ }
+
+done:
+ /* close config file */
+ fclose(fp);
+
+ return rc;
+}
+
+int options_command_line(int argc, char *argv[], int (*handle_options)(int short_option, int argi, char *argv[]))
+{
+ option_t *option;
+ char params[1024];
+ int argi, i;
+ int rc;
+
+ for (argi = 1; argi < argc; argi++) {
+ if (argv[argi][0] == '-') {
+ if (argv[argi][1] != '-') {
+ if (strlen(argv[argi]) != 2) {
+ PDEBUG(DOPTIONS, DEBUG_ERROR, "Given command line option '%s' exceeds one character, use '-h' for help!\n", argv[argi]);
+ return -EINVAL;
+ }
+ /* -x */
+ for (option = option_head; option; option = option->next) {
+ if (argv[argi][1] == option->short_option) {
+ if (option->parameter_count && argi + option->parameter_count < argc) {
+ params[0] = '\0';
+ for (i = 0; i < option->parameter_count; i++)
+ sprintf(strchr(params, '\0'), " '%s'", argv[argi + 1 + i]);
+ PDEBUG(DOPTIONS, DEBUG_INFO, "Command line option '%s' ('--%s'), parameter%s\n", argv[argi], option->long_option, params);
+ } else
+ PDEBUG(DOPTIONS, DEBUG_INFO, "Command line option '%s' ('--%s')\n", argv[argi], option->long_option);
+ break;
+ }
+ }
+ } else {
+ /* --xxxxxx */
+ for (option = option_head; option; option = option->next) {
+ if (!strcmp(argv[argi] + 2, option->long_option)) {
+ if (option->parameter_count && argi + option->parameter_count < argc) {
+ params[0] = '\0';
+ for (i = 0; i < option->parameter_count; i++)
+ sprintf(strchr(params, '\0'), " '%s'", argv[argi + 1 + i]);
+ PDEBUG(DOPTIONS, DEBUG_INFO, "Command line option '%s', parameter%s\n", argv[argi], params);
+ } else
+ PDEBUG(DOPTIONS, DEBUG_INFO, "Command line option '%s'\n", argv[argi]);
+ break;
+ }
+ }
+ }
+ if (!option) {
+ PDEBUG(DOPTIONS, DEBUG_ERROR, "Given command line option '%s' is not a valid option, use '-h' for help!\n", argv[argi]);
+ return -EINVAL;
+ }
+ if (argi + option->parameter_count >= argc) {
+ PDEBUG(DOPTIONS, DEBUG_ERROR, "Given command line option '%s' requires %d parameter(s), use '-h' for help!\n", argv[argi], option->parameter_count);
+ return -EINVAL;
+ }
+ rc = handle_options(option->short_option, argi + 1, argv);
+ if (rc <= 0)
+ return rc;
+ first_option = 0;
+ argi += option->parameter_count;
+ } else
+ break;
+ }
+
+ /* no more options, so we check if there is an option after a non-option parameter */
+ for (i = argi; i < argc; i++) {
+ if (argv[i][0] == '-') {
+ PDEBUG(DOPTIONS, DEBUG_ERROR, "Given command line option '%s' behind command line parameter '%s' not allowed! Please put all command line options before command line parameter(s).\n", argv[i], argv[argi]);
+ return -EINVAL;
+ }
+ }
+
+ return argi;
+}
+
+int option_is_first(void)
+{
+ return first_option;
+}
+
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