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Implement g_option_context_parse for short options

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Use getopt under the hood for old-fashioned argument parsing. Still need
to add support for --long-style-options.
This commit is contained in:
Evan Miller 2020-08-03 22:13:13 -04:00
parent fa01a6fe27
commit 255b38d7fd
1 changed files with 69 additions and 5 deletions
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74
src/libmdb/fakeglib.c
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@ -6,6 +6,7 @@
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <unistd.h>
/* string functions */
@ -261,7 +262,11 @@ gchar *g_option_context_get_help (GOptionContext *context,
"Application Options:\n");
int i=0;
for (i=0; context->entries[i].long_name; i++) {
p += snprintf(p, end - p, " -%c, --", context->entries[i].short_name);
p += snprintf(p, end - p, " ");
if (context->entries[i].short_name) {
p += snprintf(p, end - p, "-%c, ", context->entries[i].short_name);
}
p += snprintf(p, end - p, "--");
if (context->entries[i].arg_description) {
char *long_name = g_strconcat(
context->entries[i].long_name, "=",
@ -271,6 +276,9 @@ gchar *g_option_context_get_help (GOptionContext *context,
} else {
p += snprintf(p, end - p, "%-20s", context->entries[i].long_name);
}
if (!context->entries[i].short_name) {
p += snprintf(p, end - p, " ");
}
p += snprintf(p, end - p, "%s\n", context->entries[i].description);
}
p += snprintf(p, end - p, "\n");
@ -285,10 +293,66 @@ GOptionContext *g_option_context_new(const char *description) {
gboolean g_option_context_parse(GOptionContext *context,
gint *argc, gchar ***argv, GError **error) {
*error = malloc(sizeof(GError));
(*error)->message = "Not implemented";
/* TODO */
return FALSE;
int i;
int count = 0;
int len = 0;
if (*argc == 2 &&
(strcmp((*argv)[1], "-h") == 0 || strcmp((*argv)[1], "--help") == 0)) {
fprintf(stderr, "%s", g_option_context_get_help(context, TRUE, NULL));
exit(0);
}
for (i=0; context->entries[i].long_name; i++) {
GOptionArg arg = context->entries[i].arg;
count++;
len++;
if (arg == G_OPTION_ARG_STRING || arg == G_OPTION_ARG_INT) {
len++;
}
}
char *short_opts = calloc(1, len+1);
for (i=0; i<len; i++) {
GOptionArg arg = context->entries[i].arg;
short_opts[i] = context->entries[i].short_name;
if (arg == G_OPTION_ARG_STRING || arg == G_OPTION_ARG_INT) {
short_opts[++i] = ':';
}
}
int c;
opterr = 0;
while ((c = getopt(*argc, *argv, short_opts)) != -1) {
if (c == '?') {
*error = malloc(sizeof(GError));
(*error)->message = malloc(100);
snprintf((*error)->message, 100, "Unrecognized option: %c", optopt);
free(short_opts);
return FALSE;
}
for (i=0; i<count; i++) {
if (context->entries[i].short_name == c) {
GOptionArg arg = context->entries[i].arg;
if (arg == G_OPTION_ARG_NONE) {
*(int *)context->entries[i].arg_data = !(context->entries[i].flags & G_OPTION_FLAG_REVERSE);
} else if (arg == G_OPTION_ARG_INT) {
char *endptr = NULL;
*(int *)context->entries[i].arg_data = strtol(optarg, &endptr, 10);
if (*endptr) {
*error = malloc(sizeof(GError));
(*error)->message = malloc(100);
snprintf((*error)->message, 100, "Argument to -%c must be an integer", c);
free(short_opts);
return FALSE;
}
} else if (arg == G_OPTION_ARG_STRING) {
*(char **)context->entries[i].arg_data = strdup(optarg);
}
}
}
}
*argc -= (optind - 1);
*argv += (optind - 1);
free(short_opts);
return TRUE;
}
void g_option_context_free(GOptionContext *context) {