usr/src/cmd/ypcmd/revnetgroup/util.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 (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright (c) 1990, 2010, Oracle and/or its affiliates. All rights reserved.
  24  */
  25
  26 #include <stdio.h>
  27 #include <string.h>
  28 #include "util.h"
  29
  30
  31
  32
  33 /*
  34  * This is just like fgets, but recognizes that "\\n" signals a continuation
  35  * of a line
  36  */
  37 char *
  38 getaline(line, maxlen, fp)
  39         char *line;
  40         int maxlen;
  41         FILE *fp;
  42 {
  43         register char *p;
  44         register char *start;
  45         int c;
  46
  47         start = line;
  48
  49 nextline:
  50         if (fgets(start, maxlen, fp) == NULL) {
  51                 return (NULL);
  52         }
  53         for (p = start; *p; p++) {
  54                 if (*p == '\n') {
  55                         if (p > start && *(p-1) == '\\') {
  56                                 start = p - 1;
  57                                 maxlen++;
  58                                 goto nextline;
  59                         } else {
  60                                 return (line);
  61                         }
  62                 }
  63                 maxlen--;
  64         }
  65
  66         /*
  67          * Input line is too long. Rest of the line needs to be discarded.
  68          * Reinsert the last char into the stream. This is done so that
  69          * in case the last char read is '\' and it is followed by a '\n'
  70          * then the next line too can be discarded.
  71          */
  72         if (p > start)
  73                 (void) ungetc(*(p-1), fp);
  74
  75         /*
  76          * Discard the rest of the line
  77          */
  78         while ((c = getc(fp)) != EOF) {
  79                 if (c == '\n')
  80                         break;
  81                 else if (c == '\\') {
  82                         /*
  83                          * Ignore the next character except EOF
  84                          */
  85                         if (getc(fp) == EOF)
  86                                 break;
  87                 }
  88         }
  89
  90         maxlen = strlen(line) + 1;
  91
  92         /*
  93          * Certain functions expects a newline in the buffer.
  94          */
  95         if (maxlen >= 2)
  96                 line[maxlen - 2] = '\n';
  97         (void) fprintf(stderr, "Following line too long - remaining chars "
  98                         "ignored\n--- %s", line);
  99         return (line);
 100 }
 101
 102
 103 void
 104 fatal(message)
 105         char *message;
 106 {
 107         (void) fprintf(stderr, "fatal error: %s\n", message);
 108         exit(1);
 109 }