## 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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