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Make both arguments to cmp(1) mandatory and handle "-" properly

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sin 2014-11-13 15:23:28 +00:00
parent dfd0e6e77d
commit 6449db8691
1 changed files with 11 additions and 9 deletions
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14
cmp.c
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@ -10,7 +10,7 @@ enum { Same = 0, Diff = 1, Error = 2 };
static void static void
usage(void) usage(void)
{ {
enprintf(Error, "usage: %s [-ls] file1 [file2]\n", argv0); enprintf(Error, "usage: %s [-ls] file1 file2\n", argv0);
} }
int int
@ -34,24 +34,26 @@ main(int argc, char *argv[])
usage(); usage();
} ARGEND; } ARGEND;
if (argc < 1 || argc > 2) if (argc != 2)
usage(); usage();
if (argv[0][0] == '-')
argv[0] = "/dev/fd/0";
fp[0] = fopen(argv[0], "r"); fp[0] = fopen(argv[0], "r");
if (!fp[0]) { if (!fp[0]) {
if(!sflag) if(!sflag)
weprintf("fopen %s:", argv[0]); weprintf("fopen %s:", argv[0]);
exit(Error); exit(Error);
} }
fp[1] = stdin;
if (argc == 2) { if (argv[1][0] == '-')
if(!(fp[1] = fopen(argv[1], "r"))) { argv[1] = "/dev/fd/0";
fp[1] = fopen(argv[1], "r");
if (!fp[1]) {
if(!sflag) if(!sflag)
weprintf("fopen %s:", argv[1]); weprintf("fopen %s:", argv[1]);
exit(Error); exit(Error);
} }
}
for(n = 1; ; n++) { for(n = 1; ; n++) {
b[0] = getc(fp[0]); b[0] = getc(fp[0]);