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/*
* parseargs.h
*
* Command line argument parser.
*
* Copyright 1996-2002 Glyph & Cog, LLC
*/
#include <stdio.h>
#include <stddef.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include "parseargs.h"
static ArgDesc *findArg(ArgDesc *args, char *arg);
static GBool grabArg(ArgDesc *arg, int i, int *argc, char *argv[]);
GBool parseArgs(ArgDesc *args, int *argc, char *argv[]) {
ArgDesc *arg;
int i, j;
GBool ok;
ok = gTrue;
i = 1;
while (i < *argc) {
if (!strcmp(argv[i], "--")) {
--*argc;
for (j = i; j < *argc; ++j)
argv[j] = argv[j+1];
break;
} else if ((arg = findArg(args, argv[i]))) {
if (!grabArg(arg, i, argc, argv))
ok = gFalse;
} else {
++i;
}
}
return ok;
}
void printUsage(char *program, char *otherArgs, ArgDesc *args) {
ArgDesc *arg;
char *typ;
int w, w1;
w = 0;
for (arg = args; arg->arg; ++arg) {
if ((w1 = strlen(arg->arg)) > w)
w = w1;
}
fprintf(stderr, "Usage: %s [options]", program);
if (otherArgs)
fprintf(stderr, " %s", otherArgs);
fprintf(stderr, "\n");
for (arg = args; arg->arg; ++arg) {
fprintf(stderr, " %s", arg->arg);
w1 = 9 + w - strlen(arg->arg);
switch (arg->kind) {
case argInt:
case argIntDummy:
typ = " <int>";
break;
case argFP:
case argFPDummy:
typ = " <fp>";
break;
case argString:
case argStringDummy:
typ = " <string>";
break;
case argFlag:
case argFlagDummy:
default:
typ = "";
break;
}
fprintf(stderr, "%-*s", w1, typ);
if (arg->usage)
fprintf(stderr, ": %s", arg->usage);
fprintf(stderr, "\n");
}
}
static ArgDesc *findArg(ArgDesc *args, char *arg) {
ArgDesc *p;
for (p = args; p->arg; ++p) {
if (p->kind < argFlagDummy && !strcmp(p->arg, arg))
return p;
}
return NULL;
}
static GBool grabArg(ArgDesc *arg, int i, int *argc, char *argv[]) {
int n;
int j;
GBool ok;
ok = gTrue;
n = 0;
switch (arg->kind) {
case argFlag:
*(GBool *)arg->val = gTrue;
n = 1;
break;
case argInt:
if (i + 1 < *argc && isInt(argv[i+1])) {
*(int *)arg->val = atoi(argv[i+1]);
n = 2;
} else {
ok = gFalse;
n = 1;
}
break;
case argFP:
if (i + 1 < *argc && isFP(argv[i+1])) {
*(double *)arg->val = atof(argv[i+1]);
n = 2;
} else {
ok = gFalse;
n = 1;
}
break;
case argString:
if (i + 1 < *argc) {
strncpy((char *)arg->val, argv[i+1], arg->size - 1);
((char *)arg->val)[arg->size - 1] = '\0';
n = 2;
} else {
ok = gFalse;
n = 1;
}
break;
default:
fprintf(stderr, "Internal error in arg table\n");
n = 1;
break;
}
if (n > 0) {
*argc -= n;
for (j = i; j < *argc; ++j)
argv[j] = argv[j+n];
}
return ok;
}
GBool isInt(char *s) {
if (*s == '-' || *s == '+')
++s;
while (isdigit(*s))
++s;
if (*s)
return gFalse;
return gTrue;
}
GBool isFP(char *s) {
int n;
if (*s == '-' || *s == '+')
++s;
n = 0;
while (isdigit(*s)) {
++s;
++n;
}
if (*s == '.')
++s;
while (isdigit(*s)) {
++s;
++n;
}
if (n > 0 && (*s == 'e' || *s == 'E')) {
++s;
if (*s == '-' || *s == '+')
++s;
n = 0;
if (!isdigit(*s))
return gFalse;
do {
++s;
} while (isdigit(*s));
}
if (*s)
return gFalse;
return gTrue;
}
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