68 lines
1.8 KiB
C
Executable File
68 lines
1.8 KiB
C
Executable File
#define _POSIX_C_SOURCE 200809L
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#include <stdio.h>
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#include <stdlib.h>
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int main(int argc, char ** argv) {
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FILE *in_file;
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int i, error = 0, eof_reached = 0;
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char c, c_temp;
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for(i = 1; i < argc; i++) {
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/* If - is passed as an argument, set the input file to stdin */
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if(argv[i][0] == '-' && argv[i][1] == '\0') {
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in_file = stdin;
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}
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else {
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/* Open the file given */
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in_file = fopen(argv[i], "r");
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if(in_file == NULL) {
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/* If it can't open, set that we encountered an error */
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/*
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TODO: this should probably check errno instead of
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assuming that we can't find the file
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*/
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fprintf(stderr, "Cannot find file %s\n", argv[i]);
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error = 1;
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continue;
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}
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}
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/*
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Loop through the file line by line, applying transformations based on
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the first character of the line, as given by the POSIX spec.
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*/
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eof_reached = 0;
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while(!eof_reached) {
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c = fgetc(in_file);
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/*
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Get the first character of the line and print the right thing
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*/
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switch(c) {
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case '1': printf("\f"); break; /* Form feed on 1 */
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case '0': printf("\n"); break; /* New line on 0 */
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case '+': printf("\r"); break; /* Carriage return on + */
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case EOF: eof_reached = 1; continue; /* Leave on EOF */
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/* Anything else, don't do anything */
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}
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/* Print out the rest of the line unless we hit an EOF, where we quit. */
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for(c_temp = fgetc(in_file); c_temp != '\n'; c_temp = fgetc(in_file)) {
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if(c_temp == EOF) {
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eof_reached = 1;
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break;
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}
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else
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printf("%c", c_temp);
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}
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}
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printf("\n");
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}
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/* If we ever hit an error, return 1. */
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if(error) {
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return 1;
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}
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else {
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return 0;
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}
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}
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