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/* vi: set sw=4 ts=4:
*
* cmp.c - Compare two files.
*
* Copyright 2012 Timothy Elliott <tle@holymonkey.com>
*
* See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/cmp.html
USE_CMP(NEWTOY(cmp, "<2>2ls", TOYFLAG_USR|TOYFLAG_BIN))
config CMP
bool "cmp"
default y
help
usage: cmp [-l] [-s] FILE1 FILE2
Compare the contents of two files.
-l show all differing bytes
-s silent
*/
#include "toys.h"
#define FLAG_s 1
#define FLAG_l 2
int get_fd(char *file)
{
int fd;
if (!strcmp(file,"-")) fd=0;
else if (0>(fd = open(file, O_RDONLY, 0))) {
perror_exit("%s", file);
}
return fd;
}
void do_cmp(int fd1, int fd2, char *file1, char *file2, char *buf1, char *buf2,
size_t size) {
int i, len1, len2, min_len;
size_t byte_no = 1, line_no = 1;
for (;;) {
len1 = read(fd1, buf1, size);
len2 = read(fd2, buf2, size);
min_len = len1 < len2 ? len1 : len2;
for (i=0; i<min_len; i++) {
if (buf1[i] != buf2[i]) {
toys.exitval = 1;
if (toys.optflags & FLAG_l) {
printf("%d %o %o\n", byte_no, buf1[i],
buf2[i]);
}
else {
if (!(toys.optflags & FLAG_s)) {
printf("%s %s differ: char %d, line %d\n",
file1, file2, byte_no,
line_no);
}
return;
}
}
byte_no++;
if (buf1[i] == '\n') line_no++;
}
if (len1 != len2) {
if (!(toys.optflags & FLAG_s)) {
fdprintf(2, "cmp: EOF on %s\n",
len1 < len2 ? file1 : file2);
}
toys.exitval = 1;
break;
}
if (len1 < 1) break;
}
}
void cmp_main(void)
{
char *file1 = toys.optargs[0];
char *file2 = toys.optargs[1];
int fd1, fd2, size=sizeof(toybuf);
char *toybuf2 = xmalloc(size);
fd1 = get_fd(file1);
fd2 = get_fd(file2);
do_cmp(fd1, fd2, file1, file2, toybuf, toybuf2, size);
close(fd1);
close(fd2);
free(toybuf2);
}
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