usr/src/tools/cscope-fast/vpinit.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*      Copyright (c) 1988 AT&T */
  23 /*        All Rights Reserved   */
  24
  25
  26 /*
  27  * Copyright (c) 1999 by Sun Microsystems, Inc.
  28  * All rights reserved.
  29  */
  30
  31 #pragma ident   "%Z%%M% %I%     %E% SMI"
  32
  33 /* vpinit - initialize vpdirs or update vpdirs based on currentdir */
  34
  35 #include <sys/types.h>
  36 #include <string.h>     /* string functions */
  37 #include <stdlib.h>
  38 #include <stdio.h>      /* stderr */
  39 #include "vp.h"
  40 #include "library.h"
  41
  42 char    **vpdirs;       /* directories (including current) in view path */
  43 int     vpndirs;        /* number of directories in view path */
  44
  45 char    *argv0 = "libvp";       /* command name default for messages */
  46
  47 void
  48 vpinit(char *currentdir)
  49 {
  50         char    *suffix;        /* path from view path node */
  51         char    *vpath;         /* VPATH environment variable value */
  52         char    buf[MAXPATH + 1];
  53         int     i;
  54         char    *s;
  55
  56         /* if an existing directory list is to be updated, free it */
  57         if (currentdir != NULL && vpndirs > 0) {
  58                 for (i = 0; i < vpndirs; ++i) {
  59                         free(vpdirs[i]);
  60                 }
  61                 free(vpdirs);
  62                 vpndirs = 0;
  63         }
  64         /* return if the directory list has been computed */
  65         /* or there isn't a view path environment variable */
  66         if (vpndirs > 0 || (vpath = getenv("VPATH")) == NULL ||
  67             *vpath == '\0') {
  68                 return;
  69         }
  70         /* if not given, get the current directory name */
  71         if (currentdir == NULL && (currentdir = mygetwd(buf)) == NULL) {
  72                 (void) fprintf(stderr,
  73                     "%s: cannot get current directory name\n", argv0);
  74                 return;
  75         }
  76         /* see if this directory is in the first view path node */
  77         for (i = 0; vpath[i] == currentdir[i] && vpath[i] != '\0'; ++i) {
  78                 ;
  79         }
  80         if (i == 0 || (vpath[i] != ':' && vpath[i] != '\0') ||
  81             (currentdir[i] != '/' && currentdir[i] != '\0')) {
  82                 return;
  83         }
  84         suffix = &currentdir[i];
  85
  86         /* count the nodes in the view path */
  87         vpndirs = 1;
  88         for (s = vpath; *s != '\0'; ++s) {
  89                 if (*s == ':' && *(s + 1) != ':' && *(s + 1) != '\0') {
  90                         ++vpndirs;
  91                 }
  92         }
  93         /* create the source directory list */
  94         vpdirs = (char **)mymalloc(vpndirs * sizeof (char *));
  95
  96         /* don't change VPATH in the environment */
  97         vpath = stralloc(vpath);
  98
  99         /* split the view path into nodes */
 100         for (i = 0, s = vpath; i < vpndirs && *s != '\0'; ++i) {
 101                 while (*s == ':') {     /* ignore null nodes */
 102                         ++s;
 103                 }
 104                 vpdirs[i] = s;
 105                 while (*s != '\0' && *++s != ':') {
 106                         if (*s == '\n') {
 107                                 *s = '\0';
 108                         }
 109                 }
 110                 if (*s != '\0') {
 111                         *s++ = '\0';
 112                 }
 113         }
 114         /* convert the view path nodes to directories */
 115         for (i = 0; i < vpndirs; ++i) {
 116                 s = mymalloc((strlen(vpdirs[i]) + strlen(suffix) + 1));
 117                 (void) strcpy(s, vpdirs[i]);
 118                 (void) strcat(s, suffix);
 119                 vpdirs[i] = s;
 120         }
 121         free(vpath);
 122 }