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97 lines (85 loc) · 1.77 KB
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/* getarg.c:
* Replacement for the POSIX getopt() function for processing
* command-line options. I use it for compiling programs that require command-
* line arguments under Windows, but my goal is to have it portable to use
* in programs compiled on other platforms.
*
* Although I've consulted the relavant getopt() manual pages, this
* implementation is entirely my own.
*
* Use it as you would use getopt(), but replace all the "opt" prefixes
* with "arg"
*
* See getarg.h for more info
*
* This is free and unencumbered software released into the public domain.
* http://unlicense.org/
*/
#include <stdio.h>
char *argarg = 0;
int argind = 1, argopt, argerr = 1;
char getarg(int argc, char * const argv[], const char *opts)
{
static char *a = 0;
const char *c;
argopt = 0;
argarg = 0;
if(!opts || !argv) return -1;
if(!a)
{
if(argind >= argc) return -1;
a = argv[argind];
if(a[0] != '-')
return -1;
else
a++;
}
else if(a[0] == '\0')
{
if(++argind >= argc) return -1;
a = argv[argind];
if(a[0] != '-')
return -1;
else
a++;
}
argopt = a[0];
if(a[0] == '-')
{
argind++;
return -1;
}
for(c = opts; c[0]; c++)
{
if(c[0] == a[0])
{
if(c[1] == ':')
{
if(a[1] != '\0')
{
argarg = a + 1;
while(a[0]) a++;
return argopt;
}
else
{
a++;
if(++argind >= argc)
{
if(argerr) fprintf(stderr, "argument '-%c' missing a value\n", a[0]);
return ':';
}
argarg = argv[argind];
return argopt;
}
}
else
{
a++;
return argopt;
}
}
}
if(argerr) fprintf(stderr, "unknown option '-%c'\n", a[0]);
return '?';
}