date and time created 80/10/09 22:46:38 by bill

SCCS-vsn: usr.bin/diff/diff/diff.c 4.1

diff --git a/usr/src/usr.bin/diff/diff/diff.c b/usr/src/usr.bin/diff/diff/diff.c
new file mode 100644 (file)
index 0000000..84c0977
--- /dev/null
+++ b/usr/src/usr.bin/diff/diff/diff.c
@@ -0,0 +1,202 @@
+static char sccsid[] = "@(#)diff.c 4.1 %G%";
+
+#include "diff.h"
+/*
+ * diff - driver and subroutines
+ */
+
+char   diff[] = DIFF;
+char   diffh[] = DIFFH;
+char   pr[] = PR;
+extern char _sobuf[];
+
+main(argc, argv)
+       int argc;
+       char **argv;
+{
+       register char *argp;
+
+       ifdef1 = "FILE1"; ifdef2 = "FILE2";
+       status = 2;
+       diffargv = argv;
+       setbuf(stdout, _sobuf);
+       argc--, argv++;
+       while (argc > 2 && argv[0][0] == '-') {
+               argp = &argv[0][1];
+               argv++, argc--;
+               while (*argp) switch(*argp++) {
+
+#ifdef notdef
+               case 'I':
+                       opt = D_IFDEF;
+                       wantelses = 0;
+                       continue;
+               case 'E':
+                       opt = D_IFDEF;
+                       wantelses = 1;
+                       continue;
+               case '1':
+                       opt = D_IFDEF;
+                       ifdef1 = argp;
+                       *--argp = 0;
+                       continue;
+#endif
+               case 'D':
+                       /* -Dfoo = -E -1 -2foo */
+                       wantelses = 1;
+                       ifdef1 = "";
+                       /* fall through */
+#ifdef notdef
+               case '2':
+#endif
+                       opt = D_IFDEF;
+                       ifdef2 = argp;
+                       *--argp = 0;
+                       continue;
+               case 'e':
+                       opt = D_EDIT;
+                       continue;
+               case 'f':
+                       opt = D_REVERSE;
+                       continue;
+               case 'b':
+                       bflag = 1;
+                       continue;
+               case 'c':
+                       opt = D_CONTEXT;
+                       if (isdigit(*argp)) {
+                               context = atoi(argp);
+                               while (isdigit(*argp))
+                                       argp++;
+                               if (*argp) {
+                                       fprintf(stderr,
+                                           "diff: -c: bad count\n");
+                                       done();
+                               }
+                               argp = "";
+                       } else
+                               context = 3;
+                       continue;
+               case 'h':
+                       hflag++;
+                       continue;
+               case 'S':
+                       if (*argp == 0) {
+                               fprintf(stderr, "diff: use -Sstart\n");
+                               done();
+                       }
+                       start = argp;
+                       *--argp = 0;            /* don't pass it on */
+                       continue;
+               case 'r':
+                       rflag++;
+                       continue;
+               case 's':
+                       sflag++;
+                       continue;
+               case 'l':
+                       lflag++;
+                       continue;
+               default:
+                       fprintf(stderr, "diff: -%s: unknown option\n",
+                           --argp);
+                       done();
+               }
+       }
+       if (argc != 2) {
+               fprintf(stderr, "diff: two filename arguments required\n");
+               done();
+       }
+       file1 = argv[0];
+       file2 = argv[1];
+       if (hflag && opt) {
+               fprintf(stderr,
+                   "diff: -h doesn't support -e, -f, -c, or -I\n");
+               done();
+       }
+       if (!strcmp(file1, "-"))
+               stb1.st_mode = S_IFREG;
+       else if (stat(file1, &stb1) < 0) {
+               fprintf(stderr, "diff: ");
+               perror(file1);
+               done();
+       }
+       if (!strcmp(file2, "-"))
+               stb2.st_mode = S_IFREG;
+       else if (stat(file2, &stb2) < 0) {
+               fprintf(stderr, "diff: ");
+               perror(file2);
+               done();
+       }
+       if ((stb1.st_mode & S_IFMT) == S_IFDIR &&
+           (stb2.st_mode & S_IFMT) == S_IFDIR) {
+               diffdir(argv);
+       } else
+               diffreg();
+       done();
+}
+
+char *
+savestr(cp)
+       register char *cp;
+{
+       register char *dp = malloc(strlen(cp)+1);
+
+       if (dp == 0) {
+               fprintf(stderr, "diff: ran out of memory\n");
+               done();
+       }
+       strcpy(dp, cp);
+       return (dp);
+}
+
+min(a,b)
+       int a,b;
+{
+
+       return (a < b ? a : b);
+}
+
+max(a,b)
+       int a,b;
+{
+
+       return (a > b ? a : b);
+}
+
+done()
+{
+       unlink(tempfile);
+       exit(status);
+}
+
+char *
+talloc(n)
+{
+       register char *p;
+       p = malloc((unsigned)n);
+       if(p!=NULL)
+               return(p);
+       noroom();
+}
+
+char *
+ralloc(p,n)    /*compacting reallocation */
+char *p;
+{
+       register char *q;
+       char *realloc();
+       free(p);
+       free(dummy);
+       dummy = malloc(1);
+       q = realloc(p, (unsigned)n);
+       if(q==NULL)
+               noroom();
+       return(q);
+}
+
+noroom()
+{
+       fprintf(stderr, "diff: files too big, try -h\n");
+       done();
+}