| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: str.c,v 1.2 1999/05/26 20:52:57 mdw Exp $ |
| 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 $ |
| 33 | * Revision 1.2 1999/05/26 20:52:57 mdw |
| 34 | * Add new `rest' argument for `str_split'. |
| 35 | * |
| 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 |
| 89 | * @char **rest@ = where to store the remainder of the string |
| 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 |
| 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. |
| 102 | */ |
| 103 | |
| 104 | size_t str_split(char *p, char *v[], size_t c, char **rest) |
| 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 | } |
| 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 | } |
| 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 -------------------------------------------------*/ |