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57 lines
1.3 KiB
57 lines
1.3 KiB
#include <ctype.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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const char compare_string[] = "DOUBLEPLUS UNZIP, FACTOR=";
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int main (int argc, char **argv){
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FILE *bob, *joe;
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int factor, thing, i;
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char output[FILENAME_MAX];
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if(argc < 2){
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fputs("I pity the fool who don't have an input file!\n",stderr);
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return EXIT_FAILURE;
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}
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if(strlen(argv[1]) <= 4 || strcmp(argv[1] + strlen(argv[1]) - 4, ".dpu"))
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{
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fputs("Where's the rest of the filename?\n", stderr);
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return EXIT_FAILURE;
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}
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if((bob = fopen(argv[1],"r"))==NULL){
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fputs("That's no input file, THAT'S A SPACE STATION!\n",stderr);
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return EXIT_FAILURE;
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}
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for(i = 0; compare_string[i]; i++) {
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thing = fgetc(bob);
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if(thing != compare_string[i]) {
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fputs("You suck! That's not a DPU file!\n", stderr);
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return EXIT_FAILURE;
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}
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}
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factor=0;
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for(;;){
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thing=fgetc(bob);
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if(isdigit(thing)){
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factor=(factor*10)+(thing-'0');
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}else if(thing==';'){
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break;
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}else{
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fputs("You should make it work!\n",stderr);
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return EXIT_FAILURE;
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}
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}
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strncpy(output,argv[1],strlen(argv[1])-4);
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if((joe = fopen(output,"w"))==NULL){
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fputs("Ummm, the output file doesn't work.\n",stderr);
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return EXIT_FAILURE;
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}
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while((thing=fgetc(bob))!=EOF){
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fputc(thing,joe);
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int i;
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for(i=0;i<factor;i++){
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thing = fgetc(bob);
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}
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}
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return 0;
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}
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