modules/ut/ut_string.c
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FUNCTIONS
This source file includes following functions.
- ut_string_compress
- 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