386BSD 0.1 development

Work on file usr/src/usr.bin/from/from.c

Co-Authored-By: Lynne Greer Jolitz <ljolitz@cardio.ucsf.edu>
Synthesized-from: 386BSD-0.1

diff --git a/usr/src/usr.bin/from/from.c b/usr/src/usr.bin/from/from.c
new file mode 100644 (file)
index 0000000..ea5b849
--- /dev/null
+++ b/usr/src/usr.bin/from/from.c
@@ -0,0 +1,136 @@
+/*
+ * Copyright (c) 1980, 1988 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by the University of
+ *     California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef lint
+char copyright[] =
+"@(#) Copyright (c) 1980, 1988 The Regents of the University of California.\n\
+ All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)from.c     5.7 (Berkeley) 3/1/91";
+#endif /* not lint */
+
+#include <sys/types.h>
+#include <ctype.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <paths.h>
+
+main(argc, argv)
+       int argc;
+       char **argv;
+{
+       extern char *optarg;
+       extern int optind;
+       struct passwd *pwd;
+       int ch, newline;
+       char *file, *sender, *p;
+#if MAXPATHLEN > BUFSIZ
+       char buf[MAXPATHLEN];
+#else
+       char buf[BUFSIZ];
+#endif
+
+       file = sender = NULL;
+       while ((ch = getopt(argc, argv, "f:s:")) != EOF)
+               switch((char)ch) {
+               case 'f':
+                       file = optarg;
+                       break;
+               case 's':
+                       sender = optarg;
+                       for (p = sender; *p; ++p)
+                               if (isupper(*p))
+                                       *p = tolower(*p);
+                       break;
+               case '?':
+               default:
+                       fprintf(stderr, "usage: from [-f file] [-s sender] [user]\n");
+                       exit(1);
+               }
+       argv += optind;
+
+       if (!file) {
+               if (!(file = *argv)) {
+                       if (!(pwd = getpwuid(getuid()))) {
+                               fprintf(stderr,
+                                   "from: no password file entry for you.\n");
+                               exit(1);
+                       }
+                       file = pwd->pw_name;
+               }
+               (void)sprintf(buf, "%s/%s", _PATH_MAILDIR, file);
+               file = buf;
+       }
+       if (!freopen(file, "r", stdin)) {
+               fprintf(stderr, "from: can't read %s.\n", file);
+               exit(1);
+       }
+       for (newline = 1; fgets(buf, sizeof(buf), stdin);) {
+               if (*buf == '\n') {
+                       newline = 1;
+                       continue;
+               }
+               if (newline && !strncmp(buf, "From ", 5) &&
+                   (!sender || match(buf + 5, sender)))
+                       printf("%s", buf);
+               newline = 0;
+       }
+       exit(0);
+}
+
+match(line, sender)
+       register char *line, *sender;
+{
+       register char ch, pch, first, *p, *t;
+
+       for (first = *sender++;;) {
+               if (isspace(ch = *line))
+                       return(0);
+               ++line;
+               if (isupper(ch))
+                       ch = tolower(ch);
+               if (ch != first)
+                       continue;
+               for (p = sender, t = line;;) {
+                       if (!(pch = *p++))
+                               return(1);
+                       if (isupper(ch = *t++))
+                               ch = tolower(ch);
+                       if (ch != pch)
+                               break;
+               }
+       }
+       /* NOTREACHED */
+}