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getopt.c
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getopt.c
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/*
**==============================================================================
**
** Copyright (c) Microsoft Corporation. All rights reserved. See file LICENSE
** for license information.
**
**==============================================================================
*/
#include <base/omigetopt.h>
#include <pal/strings.h>
#if 0
static void PrintArgs(int argc, char** argv)
{
int i;
printf("==== PrintArgs()\n");
printf("ARGC[%d]\n", argc);
for (i = 0; i < argc; i++)
{
printf("ARGV[%s]\n", argv[i]);
}
printf("\n");
}
#endif
int GetOpt(
int* argc,
const char* argv[],
const char* opts[],
GetOptState* state)
{
int i;
int j;
/* Clear state */
state->opt[0] = '\0';
state->arg = NULL;
state->err[0] = '\0';
for (i = state->index; i < *argc; i++)
{
if (argv[i][0] != '-')
{
state->index++;
continue;
}
/* Find option argv[i] */
for (j = 0; opts[j]; j++)
{
char opt[GETOPT_OPT_SIZE];
size_t n;
int hasArg;
/* Copy option name */
n = Strlcpy(opt, opts[j], sizeof(opt));
/* If option name too long */
if (n >= sizeof(opt))
{
Strlcpy(state->err, "bad parameter", sizeof(state->err));
return -1;
}
/* If option name zero-length */
if (n == 0)
{
Strlcpy(state->err, "bad parameter", sizeof(state->err));
return -1;
}
/* If option has argument */
if (opt[n-1] == ':')
{
hasArg = 1;
opt[n-1] = '\0';
}
else if (opt[n-1] == '?')
{
hasArg = 2;
opt[n-1] = '\0';
}
else
hasArg = 0;
/* Does argv[i] match this option? */
if (strcmp(argv[i], opt) == 0)
{
if (hasArg == 1)
{
if (i + 1 == *argc)
{
Strlcpy(state->err, "missing option argument: ",
sizeof(state->err));
Strlcat(state->err, opt, sizeof(state->err));
return -1;
}
Strlcpy(state->opt, argv[i], sizeof(state->opt));
state->arg = argv[i+1];
memmove((void*)&argv[i], (void*)&argv[i+2],
sizeof(char*) * ((*argc) - i - 1));
*argc -= 2;
return 0;
}
else
{
Strlcpy(state->opt, argv[i], sizeof(state->opt));
memmove((void*)&argv[i], (void*)&argv[i+1],
sizeof(char*) * ((*argc) - i));
*argc -= 1;
return 0;
}
}
else if (hasArg &&
strncmp(argv[i], opt, n-1) == 0 && argv[i][n-1] == '=')
{
Strlcpy(state->opt, argv[i], sizeof(state->opt));
state->opt[n-1] = '\0';
state->arg = &argv[i][n];
memmove((void*)&argv[i], (void*)&argv[i+1],
sizeof(char*) * ((*argc) - i));
*argc -= 1;
return 0;
}
}
/* Unknown option */
Strlcpy(state->err, "unknown option: ", sizeof(state->err));
Strlcat(state->err, argv[i], sizeof(state->err));
return -1;
}
/* Done */
return 1;
}