1 | /*
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2 | * $Id$
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3 | *
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4 | * New generation of string handling functions safe from a memory management point of view
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5 | * Developped by Andree Leidenfrost
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6 | */
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7 |
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8 | #include <stdlib.h>
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9 | #include <stdio.h>
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10 | #include <string.h>
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11 | #include <time.h>
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12 |
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13 | #include "mr_mem.h"
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14 |
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15 | // to get bool type
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16 | #define _MY_STUFF_H_
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17 | #include "my-stuff.h"
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18 |
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19 | /**
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20 | * Safe alternative to standard function strtok()
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21 | * @param instr
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22 | * @param delims
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23 | * @param lastpos
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24 | * @return @p
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25 | * @note this function allocates memory that needs to be freed by caller
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26 | **/
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27 | char *mr_strtok(char *instr, const char *delims, int *lastpos) {
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28 |
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29 | char *token = NULL;
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30 | char *strptr = NULL;
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31 | size_t pos1 = 0;
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32 | size_t pos2 = 0;
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33 |
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34 | if (instr == NULL) {
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35 | *lastpos = 0;
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36 | return token;
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37 | }
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38 |
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39 | if (delims == NULL) {
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40 | *lastpos = 0;
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41 | return token;
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42 | }
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43 |
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44 | if (strlen(instr) <= *lastpos) {
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45 | *lastpos = 0;
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46 | return token;
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47 | }
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48 |
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49 | strptr = instr + *lastpos;
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50 | pos2 = strspn(strptr, delims);
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51 | strptr += pos2;
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52 | pos1 = strcspn(strptr, delims);
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53 | token = (char *)mr_malloc(sizeof(*token) * (pos1 + 1));
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54 | strncpy(token, strptr, pos1);
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55 | token[pos1] = '\0';
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56 | *lastpos = *lastpos + pos1 + pos2 + 1;
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57 |
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58 | return token;
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59 | }
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60 |
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61 |
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62 | /**
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63 | * Returns the string fed to it 'inptr' with all characters to escape given
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64 | * in 'toesc' prepended by escaping character 'escchr'.
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65 | * (Prepare strings for use in system() or popen() with this function.)
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66 | * @param instr
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67 | * @param toesc
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68 | * @param escchr
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69 | * @note this function allocates memory that needs to be freed by caller
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70 | **/
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71 | char *mr_stresc(char *instr, char *toesc, const char escchr, const char specialchr) {
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72 |
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73 | char *inptr = NULL;
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74 | char *retstr = NULL;
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75 | char *retptr = NULL;
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76 | char *escptr = NULL;
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77 | int cnt = 0;
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78 | bool found = FALSE;
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79 |
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80 | inptr = instr;
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81 | // Count how many characters need escaping.
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82 | while (*inptr != '\0') {
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83 | escptr = toesc;
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84 | while (*escptr != '\0') {
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85 | if (*inptr == *escptr) {
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86 | // Found it, skip the rest.
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87 | cnt++;
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88 | // if specialchar (' or ") then replace it with '\'' or "\"" so adds 2 chars
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89 | if (*inptr == specialchr) {
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90 | cnt += 2;
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91 | }
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92 | break;
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93 | }
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94 | escptr++;
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95 | }
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96 | inptr++;
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97 | }
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98 |
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99 | inptr = instr;
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100 | retstr = (char *) mr_malloc(strlen(inptr) + cnt + 1);
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101 | retptr = retstr;
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102 |
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103 | // Prepend specified characters with escape character.
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104 | while (*inptr != '\0') {
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105 | escptr = toesc;
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106 | while (*escptr != '\0') {
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107 | if (*inptr == *escptr) {
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108 | // Found it, skip the rest.
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109 | // if specialchar (' or ") then replace it with '\'' or "\"" so adds 2 chars
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110 | if (*inptr == specialchr) {
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111 | *retptr = specialchr;
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112 | retptr++;
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113 | *retptr = escchr;
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114 | retptr++;
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115 | found = TRUE;
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116 | } else {
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117 | *retptr = escchr;
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118 | retptr++;
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119 | }
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120 | break;
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121 | }
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122 | escptr++;
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123 | }
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124 | *retptr = *inptr;
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125 | retptr++;
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126 | inptr++;
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127 | if (found) {
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128 | // finish to put the remaining specialchr
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129 | *retptr = specialchr;
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130 | retptr++;
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131 | found = FALSE;
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132 | }
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133 | }
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134 | *retptr = '\0';
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135 |
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136 | return(retstr);
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137 | }
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138 |
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139 | /* Return a string containing the date */
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140 | char *mr_date(void) {
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141 |
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142 | time_t tcurr;
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143 |
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144 | tcurr = time(NULL);
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145 | return(ctime(&tcurr));
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146 | }
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147 |
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148 | /* Return an allocated string containing the date
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149 | char *mr_date(void) {
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150 |
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151 | time_t tcurr;
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152 | char *tmp = NULL;
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153 |
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154 | tcurr = time(NULL);
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155 | mr_asprintf(tmp, "%s", ctime(&tcurr));
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156 | mr_chomp(tmp);
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157 | return(tmp);
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158 | }
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159 | */
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160 |
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161 | /**
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162 | * Remove all characters whose ASCII value is less than or equal to 32
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163 | * (spaces and control characters) from both sides of @p instr.
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164 | * @param instr The string to strip spaces/control characters from
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165 | * returns a newly allocated string without the spaces that needs to be freed
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166 | * by the caller
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167 | */
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168 | char *mr_strip_spaces(const char *instr) {
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169 |
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170 | char *q = NULL;
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171 | char *outstr = NULL;
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172 |
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173 | if (instr == NULL) {
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174 | return(NULL);
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175 | }
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176 |
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177 | /* Skip initial spaces and special chars */
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178 | while (*instr <= ' ' && *instr != '\0') {
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179 | instr++;
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180 | }
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181 | mr_asprintf(outstr, "%s", instr);
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182 | q = outstr + strlen(outstr) -1;
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183 |
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184 | /* Skip final spaces and special chars */
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185 | while (*q <= ' ' && q != outstr) {
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186 | q--;
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187 | }
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188 |
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189 | /* The string now ends after that char */
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190 | q++;
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191 | *q = '\0';
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192 | return(outstr);
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193 | }
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194 |
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195 | /* Subsitute the string token in the string in by the string subst */
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196 | char *mr_str_substitute(const char *in, const char *token, const char *subst) {
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197 |
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198 | char *output = NULL;
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199 | char *tmp = NULL;
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200 | int i = 0;
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201 |
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202 | mr_asprintf(output, "%s", in);
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203 | tmp = strstr(output, token);
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204 | if (tmp == NULL) {
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205 | // token not found returning initial string unmodified
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206 | return(output);
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207 | }
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208 | // token found: end string here for now
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209 | *tmp = '\0';
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210 |
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211 | // Add subst content to the string
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212 | mr_strcat(output,subst);
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213 |
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214 | // now add the rest of in
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215 | tmp = strstr(in, token);
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216 | for (; i < strlen(token) ; i++) {
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217 | tmp++;
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218 | }
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219 | mr_strcat(output,tmp);
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220 | return(output);
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221 | }
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222 |
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223 |
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224 | /*
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225 | * Remove '\n' char from both sides of @p in_out.
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226 | * @param in_out The string to strip characters from (modified).
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227 |
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228 | void mr_chomp(char *in_out) {
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229 |
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230 | mr_strip_char(in_out, "\n");
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231 | }
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232 | */
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233 |
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234 | /**
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235 | * Remove all characters in caracs from begining and end of string @p in_out
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236 | * @param in_out The string to strip char characters from (modified).
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237 |
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238 | void mr_strip_char(char *in_out, char *caracs) {
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239 | int i = 0;
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240 | int j = 0;
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241 | size_t length = 0;
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242 |
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243 | if (caracs == NULL) {
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244 | return;
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245 | }
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246 | if (in_out == NULL) {
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247 | return;
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248 | }
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249 | length = strlen(in_out);
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250 |
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251 | // Skip initial caracs
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252 | for (i = 0; index(caracs, in_out[i]) != NULL && i < (int)length ; i++);
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253 |
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254 | // Shift the string to the begining if needed
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255 | if (i != 0) {
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256 | for (j = 0; i < (int)length ; i++, j++) {
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257 | in_out[j] = in_out[i];
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258 | }
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259 | // Erase the end of the string if needed
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260 | j++;
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261 | in_out[j] = '\0';
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262 | }
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263 |
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264 | // Skip final caracs
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265 | for (i = (int)strlen(in_out) - 1; i >= 0 && index(caracs, in_out[i]) != NULL; i--);
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266 |
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267 | // The string now ends after that char
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268 | i++;
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269 | in_out[i] = '\0';
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270 | }
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271 | */
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272 |
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