FENIX_coreutils/asa.c
2022-10-06 02:12:56 -05:00

67 lines
1.8 KiB
C
Executable file

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