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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: str.c,v 1.2 1999/05/26 20:52:57 mdw Exp $ |
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4 | * |
5 | * Functions for hacking with strings |
6 | * |
7 | * (c) 1999 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of the mLib utilities library. |
13 | * |
14 | * mLib is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU Library General Public License as |
16 | * published by the Free Software Foundation; either version 2 of the |
17 | * License, or (at your option) any later version. |
18 | * |
19 | * mLib is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU Library General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU Library General Public |
25 | * License along with mLib; if not, write to the Free |
26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
27 | * MA 02111-1307, USA. |
28 | */ |
29 | |
30 | /*----- Revision history --------------------------------------------------* |
31 | * |
32 | * $Log: str.c,v $ |
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33 | * Revision 1.2 1999/05/26 20:52:57 mdw |
34 | * Add new `rest' argument for `str_split'. |
35 | * |
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36 | * Revision 1.1 1999/05/17 20:37:01 mdw |
37 | * Some trivial string hacks. |
38 | * |
39 | */ |
40 | |
41 | /*----- Header files ------------------------------------------------------*/ |
42 | |
43 | #include <ctype.h> |
44 | #include <stdio.h> |
45 | #include <stdlib.h> |
46 | #include <string.h> |
47 | |
48 | #include "str.h" |
49 | |
50 | /*----- Main code ---------------------------------------------------------*/ |
51 | |
52 | /* --- @str_getword@ --- * |
53 | * |
54 | * Arguments: @char **pp@ = address of pointer into string |
55 | * |
56 | * Returns: Pointer to the next space-separated word from the string, |
57 | * or null. |
58 | * |
59 | * Use: Parses off space-separated words from a string. |
60 | */ |
61 | |
62 | char *str_getword(char **pp) |
63 | { |
64 | char *p = *pp, *q; |
65 | |
66 | if (!p) |
67 | return (0); |
68 | |
69 | while (isspace((unsigned char)*p)) |
70 | p++; |
71 | |
72 | for (q = p; *q; q++) { |
73 | if (isspace((unsigned char)*q)) { |
74 | *q = 0; |
75 | *pp = q + 1; |
76 | return (p); |
77 | } |
78 | } |
79 | |
80 | *pp = 0; |
81 | return (p); |
82 | } |
83 | |
84 | /* --- @str_split@ --- * |
85 | * |
86 | * Arguments: @char *p@ = pointer to string |
87 | * @char *v[]@ = pointer to array to fill in |
88 | * @size_t c@ = count of strings to fill in |
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89 | * @char **rest@ = where to store the remainder of the string |
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90 | * |
91 | * Returns: Number of strings filled in. |
92 | * |
93 | * Use: Fills an array with pointers to the individual words of a |
94 | * string. The string is modified in place to contain zero |
95 | * bytes at the word boundaries, and the words have leading |
96 | * and trailing space stripped off. No more than @c@ words |
97 | * are read; the actual number is returned as the value of the |
98 | * function. Unused slots in the array are populated with |
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99 | * null bytes. If there's any string left, the address of the |
100 | * remainder is stored in @rest@ (if it's non-null); otherwise |
101 | * @rest@ is set to a null pointer. |
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102 | */ |
103 | |
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104 | size_t str_split(char *p, char *v[], size_t c, char **rest) |
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105 | { |
106 | size_t n = 0; |
107 | char *q; |
108 | |
109 | while (c && (q = str_getword(&p)) != 0) { |
110 | *v++ = q; |
111 | c--; |
112 | n++; |
113 | } |
114 | |
115 | while (c) { |
116 | *v++ = 0; |
117 | c--; |
118 | } |
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119 | |
120 | if (rest) { |
121 | if (!p) |
122 | *rest = 0; |
123 | else { |
124 | while (isspace((unsigned char)*p)) |
125 | p++; |
126 | if (*p) |
127 | *rest = p; |
128 | else |
129 | *rest = 0; |
130 | } |
131 | } |
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132 | return (n); |
133 | } |
134 | |
135 | /* --- @str_sanitize@ --- * |
136 | * |
137 | * Arguments: @char *d@ = destination buffer |
138 | * @const char *p@ = pointer to source string |
139 | * @size_t sz@ = size of destination buffer |
140 | * |
141 | * Returns: --- |
142 | * |
143 | * Use: Writes a string into a buffer, being careful not to overflow |
144 | * the buffer, to null terminate the result, and to prevent |
145 | * nasty nonprintable characters ending up in the buffer. |
146 | */ |
147 | |
148 | void str_sanitize(char *d, const char *p, size_t sz) |
149 | { |
150 | if (!sz) |
151 | return; |
152 | sz--; |
153 | while (*p && sz) { |
154 | int ch = *p++; |
155 | if (!isgraph((unsigned char)ch)) |
156 | ch = '_'; |
157 | *d++ = ch; |
158 | sz--; |
159 | } |
160 | *d++ = 0; |
161 | } |
162 | |
163 | /*----- That's all, folks -------------------------------------------------*/ |