52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
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#include <stdio.h>
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#include <errno.h>
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#include <stdlib.h>
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// won't work on windaws.
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void unix_to_dos(char * filename) {
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// "Use the stdin and stdout file streams." NO.
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FILE * file = fopen(filename, "r");
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FILE * out;
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// open
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if ( !file ) {
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fprintf(stderr, "Error opening file.\n");
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exit(errno); // exit
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}
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system("touch converted.txt"); // create new file.
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if ( !(out = fopen("converted.txt", "w")) ) {
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fprintf(stderr, "Error opening output file. Are you using windows?\n");
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exit(errno); // exit
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}
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int c;
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while ( (c = fgetc(file)) != EOF ) {
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if ( c == '\n') {
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fputc('\r', out); // we're placing the character in the out file.
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fputc(c, out); // c is newline.
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} else {
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fputc(c, out); // c is whatever
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}
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}
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// close
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if ( fclose(file) || fclose(out) ) { // fclose returns zero on successful close
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fprintf(stderr, "Error closing file\n");
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exit(errno);
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}
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}
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int main(int argc, char *argv[]) {
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if ( argc != 2) {
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fprintf(stderr, "Invalid number of arguments.\n");
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fprintf(stderr, "Correct ussage: %s filename\n", argv[0]);
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return 1;
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}
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unix_to_dos(argv[1]);
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return 0;
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}
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