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-rw-r--r--toys/cmp.c97
1 files changed, 97 insertions, 0 deletions
diff --git a/toys/cmp.c b/toys/cmp.c
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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);
+}
+