date and time created 87/06/29 20:53:49 by bostic

SCCS-vsn: usr.bin/apropos/apropos.c 5.1

diff --git a/usr/src/usr.bin/apropos/apropos.c b/usr/src/usr.bin/apropos/apropos.c
new file mode 100644 (file)
index 0000000..b9a8b62
--- /dev/null
+++ b/usr/src/usr.bin/apropos/apropos.c
@@ -0,0 +1,176 @@
+/*
+ * Copyright (c) 1987 Regents of the University of California.
+ * All rights reserved.  The Berkeley software License Agreement
+ * specifies the terms and conditions for redistribution.
+ */
+
+#ifndef lint
+char copyright[] =
+"@(#) Copyright (c) 1987 Regents of the University of California.\n\
+ All rights reserved.\n";
+#endif not lint
+
+#ifndef lint
+static char sccsid[] = "@(#)apropos.c  5.1 (Berkeley) %G%";
+#endif not lint
+
+#include <sys/param.h>
+#include <stdio.h>
+#include <ctype.h>
+
+#define        DEF_PATH        "/usr/man"              /* default man path */
+#define        MAXLINELEN      500                     /* max line handled */
+#define        NO              0                       /* no/false */
+#define        WHATIS          "whatis"                /* database name */
+#define        YES             1                       /* yes/true */
+
+static char    *myname;
+
+main(argc, argv)
+       int     argc;
+       char    **argv;
+{
+       extern char     *optarg;
+       extern int      optind;
+       register char   *beg, *end, **C;
+       int     ch, foundman = NO, *found, isapropos,
+               a_match(), w_match(), (*match)();
+       char    *manpath = NULL,
+               buf[MAXLINELEN + 1], fname[MAXPATHLEN + 1],
+               wbuf[MAXLINELEN + 1],
+               *getenv(), *index(), *malloc(), *rindex();
+
+       myname = (beg = rindex(*argv, '/')) ? beg + 1 : *argv;
+       if (!strcmp(myname, "apropos")) {
+               isapropos = YES;
+               match = a_match;
+       }
+       else {
+               isapropos = NO;
+               match = w_match;
+       }
+       while ((ch = getopt(argc, argv, "M:P:")) != EOF)
+               switch((char)ch) {
+                       case 'M':
+                       case 'P':               /* backward contemptible */
+                               manpath = optarg;
+                               break;
+                       case '?':
+                       default:
+                               usage();
+               }
+       argv += optind;
+       argc -= optind;
+       if (argc < 1)
+               usage();
+
+       if (!(manpath = getenv("MANPATH")))
+               manpath = DEF_PATH;
+
+       /*NOSTRICT*/
+       if (!(found = (int *)malloc((u_int)argc))) {
+               fprintf(stderr, "%s: out of space.\n", myname);
+               exit(1);
+       }
+       bzero(found, argc * sizeof(int));       /* calloc is silly */
+
+       if (!isapropos)
+               for (C = argv; *C; ++C) {       /* trim full paths */
+                       if (beg = rindex(*C, '/'))
+                               *C = beg + 1;
+               }
+       for (C = argv; *C; ++C)                 /* convert to lower-case */
+               lowstr(*C, *C);
+
+       for (beg = manpath; beg; beg = end) {   /* through path list */
+               end = index(beg, ':');
+               if (!end)
+                       (void)sprintf(fname, "%s/%s", beg, WHATIS);
+               else {
+                       (void)sprintf(fname, "%.*s/%s", end - beg, beg, WHATIS);
+                       ++end;
+               }
+                                               /* for each file found */
+               if (freopen(fname, "r", stdin)) {
+                       foundman = YES;
+                       while (gets(buf)) {     /* read & convert to lcase */
+                               lowstr(buf, wbuf);
+                               for (C = argv; *C; ++C)
+                                       if ((*match)(wbuf, *C)) {
+                                               puts(buf);
+                                               found[C - argv] = YES;
+
+                                               /* only print line once */
+                                               while (*++C)
+                                                       if ((*match)(wbuf, *C))
+                                                               found[C - argv] = YES;
+                                               break;
+                                       }
+                       }
+               }
+       }
+       if (!foundman) {
+               fprintf(stderr, "%s: no %s file found in %s.\n", myname, WHATIS, manpath);
+               exit(1);
+       }
+       for (C = argv; *C; C++)
+               if (!found[C - argv])
+                       printf("%s: %s\n", *C, isapropos ? "nothing appropriate" : "not found");
+}
+
+static
+a_match(bp, str)
+       register char   *bp, *str;
+{
+       register char   test, *Cs, *Cb;
+
+       if (!*bp)
+               return(NO);
+       /* backward contemptible: everything matches empty string */
+       if (!*str)
+               return(YES);
+       for (test = *str++; *bp;)
+               if (test == *bp++) {
+                       Cs = str;
+                       Cb = bp;
+                       do {
+                               if (!*Cs)
+                                       return(YES);
+                       } while (*Cb++ == *Cs++);
+               }
+       return(NO);
+}
+
+static
+w_match(bp, str)
+       register char   *bp, *str;
+{
+       register char   test, *Cs, *Cb;
+
+       if (!*str || !*bp)
+               return(NO);
+       for (test = *str++; *bp;)
+               if (test == *bp++) {
+                       for (Cs = str, Cb = bp; *Cs == *Cb; ++Cs, ++Cb);
+                       if (!*Cs && (isspace(*Cb) || *Cb == '(' || *Cb == ','))
+                               return(YES);
+               }
+       return(NO);
+}
+
+static
+lowstr(from, to)
+       register char   *from, *to;
+{
+       for (; *from; ++from, ++to)
+               *to = isupper(*from) ? tolower(*from) : *from;
+       *to = '\0';
+}
+
+static
+usage()
+{
+       fprintf(stderr, "usage: %s [-M path] string ...\n", myname);
+       exit(1);
+}
+