67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
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#include <stdio.h>
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#include <errno.h>
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#include <string.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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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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// It would have been easier if we worked on the current file,
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// without creating a separated file for the converted file.
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char * out_filename = malloc( 5 + strlen(filename) ); // dos_ (4) + filename (strlen) + NULL (1)
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memcpy( out_filename, "dos_", 4 );
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memcpy( out_filename + 4, filename, strlen(filename) + 1 ); // + 1 to copy the null
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// we want to perform the following command:
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// touch dos_filename.ext
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// 5 + 1 + strlen(out_filename) + 1
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char * command = malloc( 7 + strlen(out_filename) );
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memcpy(command, "touch ", 6);
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memcpy(command + 6, out_filename, strlen(out_filename) + 1); // + 1 to copy the terminating NULL
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system(command); // create new file.
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if ( !(out = fopen(out_filename, "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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free(out_filename);
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free(command);
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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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// *.c will expand to all the files in the current dir. eg: 1.c 2.c 3.c et.c
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for (int i = 1; i < argc; i++) {
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unix_to_dos( argv[i] );
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}
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return 0;
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}
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