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#define _XOPEN_SOURCE 700
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
int
cat(FILE *fp, const char *fname) {
int c = -1;
while ((c = fgetc(fp)) != EOF) {
putchar(c);
}
/* Check whether the EOF came from an end-of-file or an error. */
if ((ferror(fp))) {
fprintf(stderr, "cat: fgetc %s: %s\n", fname, strerror(errno));
return 1;
}
return 0;
}
int
main(int argc, char **argv) {
if (argc > 1 && **(argv + 1) == '-' && *(*(argv + 1) + 1) == 'u') {
/* ignore -u */
argv++;
argc--;
}
if (argc == 1) {
return cat(stdin, "stdin");
}
int err = 0;
const char *fname = NULL;
FILE *fp = NULL;
while (*++argv) {
if (**argv == '-' && *(*argv + 1) == '\0') {
fp = stdin;
fname = "stdin";
} else {
fp = fopen(*argv, "r");
if (!fp) {
fprintf(stderr, "cat: fopen %s: %s\n", *argv, strerror(errno));
err = 1;
continue;
}
fname = *argv;
}
if ((cat(fp, fname)) == 1) {
err = 1;
}
if (fp != stdin && (fclose(fp)) == EOF) {
fprintf(stderr, "cat: fclose %s: %s\n", fname, strerror(errno));
err = 1;
}
}
return err;
}
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