forked from bonsai/harakit
79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
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#include <errno.h> /* maybe */
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#include <fcntl.h> /* no */
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#include <sysexits.h> /* sure */
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#include <stdbool.h> /* no */
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#include <stdio.h> /* yes */
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#include <stdlib.h> /* yes */
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#include <string.h> /* maybe */
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#include <unistd.h> /* yes */
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#define BUF_SIZE 4096
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unsigned char u = 0; /* unbuffered */
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unsigned char buf[BUF_SIZE];
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void usage(char *argv0){
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fprintf(stderr, "Usage: %s (-u) (file...)\n", argv0);
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exit(EX_USAGE);
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}
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int main(int argc, char *argv[]) {
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char *argv0;
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extern int optind;
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int c;
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FILE *in;
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argv0 = argv[0];
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while ((c = getopt(argc, argv, "u")) != -1) {
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switch(c) {
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/*
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* From cat(1p):
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*
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* -u Write bytes from the input file to the standard output
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* without delay as each is read.
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*/
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case 'u':
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u = 1;
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break;
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default:
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usage(argv[0]);
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}
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}
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while(++argv != NULL) /* increments over argv[0] */
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/*
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* From cat(1p):
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*
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* file A pathname of an input file. If no file operands are
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* specified, the standard input shall be used. If a file is
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* '-', the cat utility shall read from the standard input at
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* that point in the sequence. The cat utility shall not close
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* and reopen standard input when it is referenced in this way,
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* but shall accept multiple occurrences of '-' as a file
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* operand.
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*/
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if(argv[0][0] == '-' && argv[0][1] == '\0') in = stdin;
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else if ((in = fopen(argv[0], "r")) == NULL) {
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// TODO: Add error handling
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usage(argv0);
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return EX_NOINPUT;
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}
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int byte = 0;
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char *buf = calloc(4096, 1);
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while ((c = fgetc(in) != EOF)) {
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if (u) {
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putchar(c);
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} else {
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/* fucky wucky buffering */
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}
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}
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if(!u) fputs(buf, stdout);
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if(in != stdin) fclose(file); /* who cares if it cant close */
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}
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return EX_OK;
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}
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