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56 | elmo | 1 | |
2 | /*-------------------------------------------------------------------------*/ |
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3 | /** |
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4 | @file strlib.c |
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5 | @author N. Devillard |
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6 | @date Jan 2001 |
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7 | @version $Revision: 1.8 $ |
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8 | @brief Various string handling routines to complement the C lib. |
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9 | |||
10 | This modules adds a few complementary string routines usually missing |
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11 | in the standard C library. |
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12 | */ |
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13 | /*--------------------------------------------------------------------------*/ |
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14 | |||
15 | /* |
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16 | $Id: strlib.c,v 1.8 2002/12/12 10:29:16 ndevilla Exp $ |
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17 | $Author: ndevilla $ |
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18 | $Date: 2002/12/12 10:29:16 $ |
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19 | $Revision: 1.8 $ |
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20 | */ |
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21 | |||
22 | /*--------------------------------------------------------------------------- |
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23 | Includes |
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24 | ---------------------------------------------------------------------------*/ |
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25 | |||
26 | #include <string.h> |
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27 | #include <ctype.h> |
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28 | |||
29 | #include "strlib.h" |
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30 | |||
31 | /*--------------------------------------------------------------------------- |
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32 | Defines |
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33 | ---------------------------------------------------------------------------*/ |
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34 | #define ASCIILINESZ 1024 |
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35 | |||
36 | /*--------------------------------------------------------------------------- |
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37 | Function codes |
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38 | ---------------------------------------------------------------------------*/ |
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39 | |||
40 | |||
41 | /*-------------------------------------------------------------------------*/ |
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42 | /** |
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43 | @brief Convert a string to lowercase. |
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44 | @param s String to convert. |
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45 | @return ptr to statically allocated string. |
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46 | |||
47 | This function returns a pointer to a statically allocated string |
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48 | containing a lowercased version of the input string. Do not free |
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49 | or modify the returned string! Since the returned string is statically |
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50 | allocated, it will be modified at each function call (not re-entrant). |
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51 | */ |
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52 | /*--------------------------------------------------------------------------*/ |
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53 | |||
54 | char * strlwc(const char * s) |
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55 | { |
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56 | static char l[ASCIILINESZ+1]; |
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57 | int i ; |
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58 | |||
59 | if (s==NULL) return NULL ; |
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60 | memset(l, 0, ASCIILINESZ+1); |
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61 | i=0 ; |
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62 | while (s[i] && i<ASCIILINESZ) { |
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63 | l[i] = (char)tolower((int)s[i]); |
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64 | i++ ; |
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65 | } |
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66 | l[ASCIILINESZ]=(char)0; |
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67 | return l ; |
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68 | } |
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69 | |||
70 | |||
71 | |||
72 | /*-------------------------------------------------------------------------*/ |
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73 | /** |
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74 | @brief Convert a string to uppercase. |
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75 | @param s String to convert. |
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76 | @return ptr to statically allocated string. |
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77 | |||
78 | This function returns a pointer to a statically allocated string |
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79 | containing an uppercased version of the input string. Do not free |
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80 | or modify the returned string! Since the returned string is statically |
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81 | allocated, it will be modified at each function call (not re-entrant). |
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82 | */ |
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83 | /*--------------------------------------------------------------------------*/ |
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84 | |||
85 | char * strupc(char * s) |
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86 | { |
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87 | static char l[ASCIILINESZ+1]; |
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88 | int i ; |
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89 | |||
90 | if (s==NULL) return NULL ; |
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91 | memset(l, 0, ASCIILINESZ+1); |
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92 | i=0 ; |
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93 | while (s[i] && i<ASCIILINESZ) { |
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94 | l[i] = (char)toupper((int)s[i]); |
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95 | i++ ; |
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96 | } |
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97 | l[ASCIILINESZ]=(char)0; |
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98 | return l ; |
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99 | } |
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100 | |||
101 | |||
102 | |||
103 | /*-------------------------------------------------------------------------*/ |
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104 | /** |
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105 | @brief Skip blanks until the first non-blank character. |
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106 | @param s String to parse. |
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107 | @return Pointer to char inside given string. |
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108 | |||
109 | This function returns a pointer to the first non-blank character in the |
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110 | given string. |
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111 | */ |
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112 | /*--------------------------------------------------------------------------*/ |
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113 | |||
114 | char * strskp(char * s) |
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115 | { |
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116 | char * skip = s; |
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117 | if (s==NULL) return NULL ; |
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118 | while (isspace((int)*skip) && *skip) skip++; |
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119 | return skip ; |
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120 | } |
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121 | |||
122 | |||
123 | |||
124 | /*-------------------------------------------------------------------------*/ |
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125 | /** |
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126 | @brief Remove blanks at the end of a string. |
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127 | @param s String to parse. |
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128 | @return ptr to statically allocated string. |
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129 | |||
130 | This function returns a pointer to a statically allocated string, |
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131 | which is identical to the input string, except that all blank |
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132 | characters at the end of the string have been removed. |
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133 | Do not free or modify the returned string! Since the returned string |
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134 | is statically allocated, it will be modified at each function call |
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135 | (not re-entrant). |
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136 | */ |
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137 | /*--------------------------------------------------------------------------*/ |
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138 | |||
139 | char * strcrop(char * s) |
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140 | { |
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141 | static char l[ASCIILINESZ+1]; |
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142 | char * last ; |
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143 | |||
144 | if (s==NULL) return NULL ; |
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145 | memset(l, 0, ASCIILINESZ+1); |
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146 | strcpy(l, s); |
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147 | last = l + strlen(l); |
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148 | while (last > l) { |
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149 | if (!isspace((int)*(last-1))) |
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150 | break ; |
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151 | last -- ; |
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152 | } |
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153 | *last = (char)0; |
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154 | return l ; |
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155 | } |
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156 | |||
157 | |||
158 | |||
159 | /*-------------------------------------------------------------------------*/ |
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160 | /** |
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161 | @brief Remove blanks at the beginning and the end of a string. |
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162 | @param s String to parse. |
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163 | @return ptr to statically allocated string. |
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164 | |||
165 | This function returns a pointer to a statically allocated string, |
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166 | which is identical to the input string, except that all blank |
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167 | characters at the end and the beg. of the string have been removed. |
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168 | Do not free or modify the returned string! Since the returned string |
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169 | is statically allocated, it will be modified at each function call |
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170 | (not re-entrant). |
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171 | */ |
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172 | /*--------------------------------------------------------------------------*/ |
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173 | char * strstrip(char * s) |
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174 | { |
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175 | static char l[ASCIILINESZ+1]; |
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176 | char * last ; |
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177 | |||
178 | if (s==NULL) return NULL ; |
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179 | |||
180 | while (isspace((int)*s) && *s) s++; |
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181 | |||
182 | memset(l, 0, ASCIILINESZ+1); |
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183 | strcpy(l, s); |
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184 | last = l + strlen(l); |
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185 | while (last > l) { |
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186 | if (!isspace((int)*(last-1))) |
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187 | break ; |
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188 | last -- ; |
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189 | } |
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190 | *last = (char)0; |
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191 | |||
192 | return (char*)l ; |
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193 | } |
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194 | |||
195 | /* Test code */ |
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196 | #ifdef TEST |
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197 | int main(int argc, char * argv[]) |
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198 | { |
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199 | char * str ; |
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200 | |||
201 | str = "\t\tI'm a lumberkack and I'm OK " ; |
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202 | printf("lowercase: [%s]\n", strlwc(str)); |
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203 | printf("uppercase: [%s]\n", strupc(str)); |
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204 | printf("skipped : [%s]\n", strskp(str)); |
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205 | printf("cropped : [%s]\n", strcrop(str)); |
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206 | printf("stripped : [%s]\n", strstrip(str)); |
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207 | |||
208 | return 0 ; |
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209 | } |
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210 | #endif |
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211 | /* vim: set ts=4 et sw=4 tw=75 */ |