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/* Copyright 2016 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include "optcmd.h"
/* Parse a flag of the form "--long-flag=<blah>" or "-F <blah>" */
static int optcmd_parse_flag(const char *argv, struct optcmd_flag *flags,
int flag_count, void **flag_results)
{
int i;
char *flag, *arg;
flag = strdup(argv);
arg = strchr(flag, '=');
if (arg) {
*arg = '\0';
arg++;
}
for (i = 0; i < flag_count; i++) {
if (!strcmp(flag, flags[i].name)) {
flag_results[i] = flags[i].arg(arg);
if (!flag_results[i]) {
printf("Unable to parse argument for %s\n", flag);
return 1;
}
return 0;
}
}
printf("Invalid flag %s specified\n", flag);
return 1;
}
/* Parse command arguments and flags */
optcmd_cmd_t *optcmd_parse(struct optcmd_cmd *cmd, const char *argv[], int argc,
void **arg_results[], void **flag_results[])
{
int i, arg_count = 0, total_arg_count, total_flag_count;
struct optcmd_arg *args = cmd->args;
struct optcmd_flag *flags = cmd->flags;
void **tmp_arg_results, **tmp_flag_results;
/* Allocate space for parser results */
for (total_arg_count = 0; args[total_arg_count].parser && total_arg_count < OPTCMD_MAX_ARGS; total_arg_count++) {}
for (total_flag_count = 0; flags[total_flag_count].arg && total_flag_count < OPTCMD_MAX_FLAGS; total_flag_count++) {}
tmp_arg_results = malloc(total_arg_count*sizeof(void *));
assert(tmp_arg_results);
tmp_flag_results = calloc(1, total_flag_count*sizeof(void *));
assert(tmp_flag_results);
for (i = 0; i < argc; i++, argv++) {
if (!strncmp(*argv, "--", 2)) {
if (optcmd_parse_flag(*argv, flags, total_flag_count, tmp_flag_results))
/* Unable to parse flag */
return NULL;
} else {
if (arg_count >= total_arg_count) {
printf("Too many arguments passed to %s\n", cmd->cmd);
return NULL;
}
tmp_arg_results[arg_count] = args[arg_count].parser(*argv);
if (!tmp_arg_results[arg_count]) {
printf("Unable to parse argument %s\n", *argv);
return NULL;
}
arg_count++;
}
}
for (arg_count = arg_count; arg_count < total_arg_count; arg_count++) {
/* Process default positional arguments */
struct optcmd_arg *arg = &args[arg_count];
if (!arg->def) {
printf("Not enough arguments passed to %s\n", cmd->cmd);
return NULL;
}
tmp_arg_results[arg_count] = arg->parser(arg->def);
if (!tmp_arg_results[arg_count]) {
printf("Programming error - unable to parse default argument %s\n", arg->def);
return NULL;
}
}
*arg_results = tmp_arg_results;
*flag_results = tmp_flag_results;
return cmd->cmdp;
}
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