modules/ut/ut_string.c

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FUNCTIONS

This source file includes following functions.
  1. ut_string_compress
  2. ut_string_chop

   1 /***************************************
   2   $Revision: 1.3 $
   3 
   4   string utilities (ut). 
   5 
   6   Status: NOT REVUED, NOT TESTED
   7 
   8   ******************/ /******************
   9   Filename            : stringutil.c
  10   Author              : marek@ripe.net
  11   ******************/ /******************
  12   Copyright (c) 1999                              RIPE NCC
  13  
  14   All Rights Reserved
  15   
  16   Permission to use, copy, modify, and distribute this software and its
  17   documentation for any purpose and without fee is hereby granted,
  18   provided that the above copyright notice appear in all copies and that
  19   both that copyright notice and this permission notice appear in
  20   supporting documentation, and that the name of the author not be
  21   used in advertising or publicity pertaining to distribution of the
  22   software without specific, written prior permission.
  23   
  24   THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
  25   ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS; IN NO EVENT SHALL
  26   AUTHOR BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
  27   DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
  28   AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  29   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  30   ***************************************/
  31 
  32 #include <string.h>
  33 #include <stdlib.h>
  34 #include <ctype.h>
  35 #include "ut_string.h"
  36 
  37 #define SPACE 0
  38 #define WORD  1
  39  
  40 /*+
  41   compress by removing leading/trailing spaces and compressing multiple
  42   whitespaces to one.
  43 
  44   allocates a string and returns it - it must be freed
  45 +*/
  46 
  47 
  48 /*++++++++++++++++++++++++++++++++++++++
  49 char *
  50 ut_string_compress    removes leading/trailing whitespaces and compresses 
  51                       multiple whitespaces to one. The result is an allocated
  52                       string and must be freed.
  53 
  54 char *input           source string
  55   ++++++++++++++++++++++++++++++++++++++*/
  56 char *
  57 ut_string_compress(char *input)
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  58 {
  59   char *inchr;
  60   char *copy = malloc(strlen(input)+1);
  61   char *outchr = copy;
  62   char *lastchr;
  63   int nowexpected = WORD; /* skip initial spaces */
  64 
  65   /* find trailing space */
  66   lastchr = strchr(input, '\0'); 
  67   while( lastchr != input ) {
  68     lastchr--;
  69     if( !isspace((int)*lastchr) ) {
  70       break;
  71     }
  72   }
  73    
  74   /* copy the string word by word, inserting spaces */
  75   inchr=input;
  76   do { 
  77     unsigned char ch = *inchr;
  78     
  79     if( isspace(ch) ) {
  80       if( nowexpected == WORD ) { 
  81         continue; /* skip this whitespace */
  82       }
  83       else { 
  84         ch = ' '; /* convert to a plain space */
  85         nowexpected = WORD; /* ignore any more spaces */
  86       }
  87     }
  88     else {
  89       nowexpected = SPACE; 
  90     }
  91     
  92     *outchr = ch;
  93     outchr++;
  94   } while(inchr++ != lastchr);
  95   
  96   *outchr = '\0';
  97   
  98   return copy;
  99 }
 100 
 101 
 102 /*++++++++++++++++++++++++++++++++++++++
 103 
 104 void
 105 ut_string_chop       removes trailing whitespaces from the string, replacing
 106                      them with '\0' characters. 
 107                      So it modifies the source string.
 108 
 109 char *input          source string
 110   ++++++++++++++++++++++++++++++++++++++*/
 111 void
 112 ut_string_chop(char *input)
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 113 {
 114   unsigned char *co = (unsigned char *)strchr(input, '\0');
 115 
 116   while( co != (unsigned char *)input && (isspace(*co) || *co == '\0') ) {
 117     *co = '\0';
 118     co--;
 119   }
 120 }
 121 

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