dpu.c

@@ -2,38 +2,27 @@
 #include <stdlib.h>
 #include <string.h>
 
-#include <getopt.h>
-
 int main (int argc, char **argv){
 	char name[FILENAME_MAX];
 	FILE *bob,*joe,*moe;
 	int thing, factor, arg;
-	int modifier;
-	factor=0;
-	while((modifier=getopt(argc,argv,"0123456789"))+1){
-		switch(modifier){
-		case '0': case '1': case '2': case '3': case '4':
-		case '5': case '6': case '7': case '8': case '9':
-			factor=factor*10+modifier-'0';
-			break;
-		default:
-			fputs("You're going to have to be clearer about what you want.\n",stderr);
+	if(argc >= 3){
+		char *end_char;
+		factor = strtol(argv[1], &end_char, 0);
+		if(!*(argv[1]) || *end_char)
+		{
+			fputs("I can haz number?\n", stderr);
 			return EXIT_FAILURE;
 		}
+		arg = 2;
+	}else{
+		factor = 9;
+		arg = 1;
 	}
-	if(factor==0){
-		factor=9;
-	}
-	argc-=optind;
-	argv+=optind;
-	arg=0;
-	if(argc<1){
+	if(argc<2){
 		fputs("I pity the fool who don't have an input file!\n",stderr);
 		return EXIT_FAILURE;
 	}
-	if(argc>1){
-		fputs("Be patient, one thing at a time!\n",stderr);
-	}
 	if(strlen(argv[arg]) >= FILENAME_MAX - 4)
 	{
 		fputs("It's a filename, not a novel.\n", stderr);