1 | #include <stdio.h> |
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2 | #include <string.h> |
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3 | #include <stdlib.h> |
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4 | #include <ctype.h> |
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5 | #include "owl.h" |
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6 | |
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7 | /* Returns a copy of 'in' with each line indented 'n' |
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8 | * characters. Result must be freed with g_free. */ |
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9 | CALLER_OWN char *owl_text_indent(const char *in, int n) |
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10 | { |
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11 | const char *ptr1, *ptr2, *last; |
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12 | GString *out = g_string_new(""); |
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13 | int i; |
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14 | |
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15 | last=in+strlen(in)-1; |
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16 | ptr1=in; |
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17 | while (ptr1<=last) { |
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18 | for (i=0; i<n; i++) { |
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19 | g_string_append_c(out, ' '); |
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20 | } |
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21 | ptr2=strchr(ptr1, '\n'); |
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22 | if (!ptr2) { |
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23 | g_string_append(out, ptr1); |
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24 | break; |
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25 | } else { |
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26 | g_string_append_len(out, ptr1, ptr2-ptr1+1); |
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27 | } |
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28 | ptr1=ptr2+1; |
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29 | } |
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30 | return g_string_free(out, false); |
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31 | } |
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32 | |
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33 | int owl_text_num_lines(const char *in) |
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34 | { |
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35 | int lines, i; |
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36 | |
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37 | lines=0; |
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38 | for (i=0; in[i]!='\0'; i++) { |
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39 | if (in[i]=='\n') lines++; |
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40 | } |
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41 | |
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42 | /* if the last char wasn't a \n there's one more line */ |
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43 | if (i>0 && in[i-1]!='\n') lines++; |
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44 | |
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45 | return(lines); |
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46 | } |
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47 | |
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48 | |
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49 | /* caller must free the return */ |
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50 | CALLER_OWN char *owl_text_htmlstrip(const char *in) |
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51 | { |
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52 | const char *ptr1, *end, *ptr2, *ptr3; |
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53 | char *out, *out2; |
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54 | |
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55 | out=g_new(char, strlen(in)+30); |
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56 | strcpy(out, ""); |
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57 | |
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58 | ptr1=in; |
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59 | end=in+strlen(in); |
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60 | |
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61 | while(ptr1<end) { |
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62 | /* look for an open bracket */ |
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63 | ptr2=strchr(ptr1, '<'); |
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64 | |
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65 | /* if none, copy in from here to end and exit */ |
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66 | if (ptr2==NULL) { |
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67 | strcat(out, ptr1); |
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68 | break; |
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69 | } |
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70 | |
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71 | /* otherwise copy in everything before the open bracket */ |
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72 | if (ptr2>ptr1) { |
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73 | strncat(out, ptr1, ptr2-ptr1); |
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74 | } |
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75 | |
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76 | /* find the close bracket */ |
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77 | ptr3=strchr(ptr2, '>'); |
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78 | |
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79 | /* if there is no close, copy as you are and exit */ |
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80 | if (!ptr3) { |
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81 | strcat(out, ptr2); |
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82 | break; |
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83 | } |
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84 | |
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85 | /* look for things we know */ |
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86 | if (!strncasecmp(ptr2, "<BODY", 5) || |
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87 | !strncasecmp(ptr2, "<FONT", 5) || |
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88 | !strncasecmp(ptr2, "<HTML", 5) || |
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89 | !strncasecmp(ptr2, "</FONT", 6) || |
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90 | !strncasecmp(ptr2, "</HTML", 6) || |
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91 | !strncasecmp(ptr2, "</BODY", 6)) { |
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92 | |
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93 | /* advance to beyond the angle brakcet and go again */ |
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94 | ptr1=ptr3+1; |
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95 | continue; |
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96 | } |
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97 | if (!strncasecmp(ptr2, "<BR>", 4)) { |
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98 | strcat(out, "\n"); |
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99 | ptr1=ptr3+1; |
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100 | continue; |
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101 | } |
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102 | |
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103 | /* if it wasn't something we know, copy to the > and go again */ |
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104 | strncat(out, ptr2, ptr3-ptr2+1); |
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105 | ptr1=ptr3+1; |
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106 | } |
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107 | |
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108 | out2=owl_text_substitute(out, "<", "<"); |
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109 | g_free(out); |
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110 | out=owl_text_substitute(out2, ">", ">"); |
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111 | g_free(out2); |
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112 | out2=owl_text_substitute(out, "&", "&"); |
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113 | g_free(out); |
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114 | out=owl_text_substitute(out2, """, "\""); |
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115 | g_free(out2); |
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116 | out2=owl_text_substitute(out, " ", " "); |
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117 | g_free(out); |
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118 | out=owl_text_substitute(out2, " ", " "); |
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119 | g_free(out2); |
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120 | out2=owl_text_substitute(out, " ", " "); |
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121 | g_free(out); |
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122 | out=owl_text_substitute(out2, "&endash;", "--"); |
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123 | g_free(out2); |
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124 | out2=owl_text_substitute(out, "&emdash;", "---"); |
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125 | g_free(out); |
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126 | |
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127 | return(out2); |
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128 | } |
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129 | |
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130 | /* Caller must free return */ |
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131 | CALLER_OWN char *owl_text_expand_tabs(const char *in) |
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132 | { |
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133 | int len = 0; |
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134 | const char *p = in; |
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135 | char *ret, *out; |
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136 | int col; |
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137 | |
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138 | col = 0; |
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139 | while(*p) { |
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140 | gunichar c = g_utf8_get_char(p); |
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141 | const char *q = g_utf8_next_char(p); |
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142 | switch (c) { |
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143 | case '\t': |
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144 | do { len++; col++; } while (col % OWL_TAB_WIDTH); |
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145 | p = q; |
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146 | continue; |
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147 | case '\n': |
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148 | col = 0; |
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149 | break; |
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150 | default: |
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151 | col += mk_wcwidth(c); |
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152 | break; |
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153 | } |
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154 | len += q - p; |
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155 | p = q; |
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156 | } |
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157 | |
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158 | ret = g_new(char, len + 1); |
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159 | |
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160 | p = in; |
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161 | out = ret; |
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162 | |
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163 | col = 0; |
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164 | while(*p) { |
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165 | gunichar c = g_utf8_get_char(p); |
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166 | const char *q = g_utf8_next_char(p); |
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167 | switch (c) { |
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168 | case '\t': |
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169 | do {*(out++) = ' '; col++; } while (col % OWL_TAB_WIDTH); |
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170 | p = q; |
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171 | continue; |
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172 | case '\n': |
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173 | col = 0; |
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174 | break; |
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175 | default: |
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176 | col += mk_wcwidth(c); |
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177 | break; |
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178 | } |
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179 | memcpy(out, p, q - p); |
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180 | out += q - p; |
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181 | p = q; |
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182 | } |
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183 | |
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184 | *out = 0; |
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185 | |
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186 | return ret; |
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187 | } |
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188 | |
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189 | /* caller must free the return */ |
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190 | CALLER_OWN char *owl_text_wordwrap(const char *in, int col) |
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191 | { |
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192 | char *out; |
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193 | int cur, lastspace, len, lastnewline; |
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194 | |
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195 | out=g_strdup(in); |
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196 | len=strlen(in); |
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197 | cur=0; |
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198 | lastspace=-1; |
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199 | lastnewline=-1; |
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200 | |
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201 | while (cur<(len-1)) { |
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202 | if (out[cur]==' ') { |
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203 | lastspace=cur; |
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204 | cur++; |
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205 | continue; |
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206 | } else if (out[cur]=='\n') { |
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207 | lastnewline=cur; |
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208 | cur++; |
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209 | continue; |
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210 | } |
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211 | |
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212 | /* do we need to wrap? */ |
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213 | if ( (cur-(lastnewline+1)) > col ) { |
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214 | if (lastspace==-1 || |
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215 | (lastnewline>0 && (lastspace<=lastnewline))) { |
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216 | /* we can't help, sorry */ |
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217 | cur++; |
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218 | continue; |
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219 | } |
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220 | |
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221 | /* turn the last space into a newline */ |
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222 | out[lastspace]='\n'; |
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223 | lastnewline=lastspace; |
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224 | lastspace=-1; |
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225 | cur++; |
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226 | continue; |
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227 | } |
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228 | |
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229 | cur++; |
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230 | continue; |
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231 | } |
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232 | return(out); |
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233 | } |
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234 | |
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235 | /* this modifies 'in' */ |
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236 | void owl_text_wordunwrap(char *in) |
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237 | { |
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238 | int i, j; |
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239 | |
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240 | j=strlen(in); |
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241 | for (i=0; i<j; i++) { |
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242 | if ( (in[i]=='\n') && |
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243 | ((i>0) && (i<(j-1))) && |
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244 | (in[i-1]!='\n') && |
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245 | (in[i+1]!='\n') ) |
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246 | in[i]=' '; |
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247 | } |
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248 | } |
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249 | |
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250 | /* return 1 if a string is only whitespace, otherwise 0 */ |
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251 | int only_whitespace(const char *s) |
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252 | { |
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253 | if (g_utf8_validate(s,-1,NULL)) { |
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254 | const char *p; |
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255 | for(p = s; p[0]; p=g_utf8_next_char(p)) { |
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256 | if (!g_unichar_isspace(g_utf8_get_char(p))) return 0; |
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257 | } |
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258 | } |
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259 | else { |
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260 | int i; |
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261 | for (i=0; s[i]; i++) { |
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262 | if (!isspace((int) s[i])) return(0); |
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263 | } |
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264 | } |
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265 | return(1); |
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266 | } |
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267 | |
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268 | /* Return a string with any occurances of 'from' replaced with 'to'. |
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269 | * Caller must free returned string. |
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270 | */ |
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271 | CALLER_OWN char *owl_text_substitute(const char *in, const char *from, const char *to) |
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272 | { |
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273 | char **split = g_strsplit(in, from, 0), *out; |
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274 | out = g_strjoinv(to, split); |
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275 | g_strfreev(split); |
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276 | return out; |
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277 | } |
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278 | |
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279 | /* Return a string which is like 'in' except that every instance of |
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280 | * any character in 'toquote' found in 'in' is preceeded by the string |
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281 | * 'quotestr'. For example, owl_text_quote(in, "+*.", "\") would |
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282 | * place a backslash before every '+', '*' or '.' in 'in'. It is |
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283 | * permissable for a character in 'quotestr' to be in 'toquote'. |
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284 | * On success returns the string, on error returns NULL. |
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285 | */ |
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286 | CALLER_OWN char *owl_text_quote(const char *in, const char *toquote, const char *quotestr) |
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287 | { |
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288 | int i, x, r, place, escape; |
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289 | int in_len, toquote_len, quotestr_len; |
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290 | char *out; |
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291 | |
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292 | in_len=strlen(in); |
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293 | toquote_len=strlen(toquote); |
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294 | quotestr_len=strlen(quotestr); |
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295 | place=0; |
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296 | escape = 0; |
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297 | for (i=0; i<in_len; i++) { |
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298 | if(strchr(toquote, in[i]) != NULL) |
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299 | escape++; |
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300 | } |
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301 | out = g_new(char, in_len + quotestr_len*escape+1); |
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302 | for (i=0; i<in_len; i++) { |
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303 | |
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304 | /* check if it's a character that needs quoting */ |
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305 | for (x=0; x<toquote_len; x++) { |
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306 | if (in[i]==toquote[x]) { |
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307 | /* quote it */ |
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308 | for (r=0; r<quotestr_len; r++) { |
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309 | out[place+r]=quotestr[r]; |
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310 | } |
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311 | place+=quotestr_len; |
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312 | break; |
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313 | } |
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314 | } |
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315 | |
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316 | /* either way, we now copy over the character */ |
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317 | out[place]=in[i]; |
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318 | place++; |
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319 | } |
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320 | out[place]='\0'; |
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321 | return(out); |
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322 | } |
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