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2714 | cejka | 1 | /* $NetBSD: mystring.c,v 1.14 1999/07/09 03:05:50 christos Exp $ */ |
2 | |||
3 | /*- |
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4 | * Copyright (c) 1991, 1993 |
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5 | * The Regents of the University of California. All rights reserved. |
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6 | * |
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7 | * This code is derived from software contributed to Berkeley by |
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8 | * Kenneth Almquist. |
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9 | * |
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10 | * Redistribution and use in source and binary forms, with or without |
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11 | * modification, are permitted provided that the following conditions |
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12 | * are met: |
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13 | * 1. Redistributions of source code must retain the above copyright |
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14 | * notice, this list of conditions and the following disclaimer. |
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15 | * 2. Redistributions in binary form must reproduce the above copyright |
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16 | * notice, this list of conditions and the following disclaimer in the |
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17 | * documentation and/or other materials provided with the distribution. |
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18 | * 3. All advertising materials mentioning features or use of this software |
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19 | * must display the following acknowledgement: |
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20 | * This product includes software developed by the University of |
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21 | * California, Berkeley and its contributors. |
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22 | * 4. Neither the name of the University nor the names of its contributors |
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23 | * may be used to endorse or promote products derived from this software |
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24 | * without specific prior written permission. |
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25 | * |
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26 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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27 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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28 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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29 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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30 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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31 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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32 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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33 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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34 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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35 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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36 | * SUCH DAMAGE. |
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37 | */ |
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38 | |||
39 | #include <sys/cdefs.h> |
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40 | #ifndef lint |
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41 | #if 0 |
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42 | static char sccsid[] = "@(#)mystring.c 8.2 (Berkeley) 5/4/95"; |
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43 | #else |
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44 | __RCSID("$NetBSD: mystring.c,v 1.14 1999/07/09 03:05:50 christos Exp $"); |
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45 | #endif |
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46 | #endif /* not lint */ |
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47 | |||
48 | /* |
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49 | * String functions. |
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50 | * |
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51 | * equal(s1, s2) Return true if strings are equal. |
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52 | * scopy(from, to) Copy a string. |
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53 | * scopyn(from, to, n) Like scopy, but checks for overflow. |
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54 | * number(s) Convert a string of digits to an integer. |
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55 | * is_number(s) Return true if s is a string of digits. |
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56 | */ |
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57 | |||
58 | #include <stdlib.h> |
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59 | #include "shell.h" |
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60 | #include "syntax.h" |
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61 | #include "error.h" |
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62 | #include "mystring.h" |
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63 | |||
64 | |||
65 | char nullstr[1]; /* zero length string */ |
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66 | |||
67 | /* |
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68 | * equal - #defined in mystring.h |
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69 | */ |
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70 | |||
71 | /* |
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72 | * scopy - #defined in mystring.h |
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73 | */ |
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74 | |||
75 | |||
76 | /* |
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77 | * scopyn - copy a string from "from" to "to", truncating the string |
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78 | * if necessary. "To" is always nul terminated, even if |
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79 | * truncation is performed. "Size" is the size of "to". |
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80 | */ |
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81 | |||
82 | void |
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83 | scopyn(from, to, size) |
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84 | char const *from; |
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85 | char *to; |
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86 | int size; |
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87 | { |
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88 | |||
89 | while (--size > 0) { |
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90 | if ((*to++ = *from++) == '\0') |
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91 | return; |
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92 | } |
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93 | *to = '\0'; |
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94 | } |
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95 | |||
96 | |||
97 | /* |
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98 | * prefix -- see if pfx is a prefix of string. |
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99 | */ |
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100 | |||
101 | int |
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102 | prefix(pfx, string) |
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103 | char const *pfx; |
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104 | char const *string; |
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105 | { |
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106 | while (*pfx) { |
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107 | if (*pfx++ != *string++) |
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108 | return 0; |
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109 | } |
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110 | return 1; |
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111 | } |
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112 | |||
113 | |||
114 | /* |
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115 | * Convert a string of digits to an integer, printing an error message on |
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116 | * failure. |
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117 | */ |
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118 | |||
119 | int |
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120 | number(s) |
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121 | const char *s; |
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122 | { |
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123 | |||
124 | if (! is_number(s)) |
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125 | error("Illegal number: %s", s); |
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126 | return atoi(s); |
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127 | } |
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128 | |||
129 | |||
130 | |||
131 | /* |
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132 | * Check for a valid number. This should be elsewhere. |
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133 | */ |
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134 | |||
135 | int |
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136 | is_number(p) |
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137 | const char *p; |
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138 | { |
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139 | do { |
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140 | if (! is_digit(*p)) |
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141 | return 0; |
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142 | } while (*++p != '\0'); |
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143 | return 1; |
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144 | } |