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annotate f-demime/ptext_in.c @ 3:7a6cd16689f5

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f-demime/Makefile: add install
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 06 May 2023 06:41:20 +0000
parents 05651a1b8ba8
children 882d97266174
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1 /*
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2 * This module implements transformations that are specific to text/plain.
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3 */
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4
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5 #include <sys/types.h>
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6 #include <stdio.h>
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7 #include <stdlib.h>
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8 #include <string.h>
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9 #include <strings.h>
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10 #include "defs.h"
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11
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12 extern void (*dec_outf)();
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13 extern FILE *tempfile;
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14 extern int text_is_utf8;
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15
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16 int ptext_has_backslash, ptext_has_linesplit;
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17
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18 static enum {
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19 FPS_GROUND,
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20 FPS_CR,
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21 FPS_UTF8
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22 } first_pass_state;
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23 static u_char utf8_buf[4];
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24 static unsigned utf8_nbytes, utf8_wptr, unicode;
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25 static unsigned out_line_len, trailing_newline;
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26
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27 static void
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28 unit_output(str)
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29 char *str;
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30 {
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31 unsigned newlen;
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32
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33 newlen = strlen(str);
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34 if (out_line_len + newlen >= OUTPUT_LINE_MAX) {
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35 putc('\\', tempfile);
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36 putc('\n', tempfile);
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37 out_line_len = 0;
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38 ptext_has_linesplit = 1;
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39 }
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40 fputs(str, tempfile);
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41 out_line_len += newlen;
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42 trailing_newline = 0;
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43 }
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44
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45 static void
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46 newline_out()
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47 {
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48 putc('\n', tempfile);
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49 out_line_len = 0;
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50 trailing_newline++;
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51 if (trailing_newline > 2)
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52 trailing_newline = 2;
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53 }
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54
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55 static void
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56 direct_output(ch)
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57 {
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58 char buf[2];
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59
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60 buf[0] = ch;
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61 buf[1] = '\0';
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62 unit_output(buf);
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63 }
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64
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65 static void
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66 simple_escape(ch)
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67 {
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68 char buf[3];
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69
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70 buf[0] = '\\';
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71 buf[1] = ch;
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72 buf[2] = '\0';
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73 unit_output(buf);
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74 }
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75
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76 static void
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77 hex_escape(ch)
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78 {
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79 char buf[5];
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80
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81 sprintf(buf, "\\x%02X", ch);
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82 unit_output(buf);
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83 }
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84
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85 static void
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86 regular_byte(ch)
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87 {
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88 if (ch == '\\') {
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89 ptext_has_backslash = 1;
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90 simple_escape(ch);
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91 return;
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92 }
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93 if (ch >= ' ' && ch <= '~') {
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94 direct_output(ch);
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95 return;
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96 }
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97 switch (ch) {
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98 case 0x07:
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99 simple_escape('a');
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100 return;
1
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101 case 0x08:
0
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102 simple_escape('b');
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103 return;
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104 case 0x09:
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105 direct_output(ch);
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106 return;
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107 case 0x0B:
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108 simple_escape('v');
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109 return;
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110 case 0x0C:
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111 simple_escape('f');
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112 return;
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113 case 0x0D:
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114 simple_escape('r');
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115 return;
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116 case 0x1B:
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117 simple_escape('e');
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118 return;
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119 }
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120 hex_escape(ch);
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121 }
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122
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123 static int
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124 utf8_collect()
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125 {
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126 switch (utf8_nbytes) {
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127 case 2:
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128 unicode = ((utf8_buf[0] & 0x1F) << 6) | (utf8_buf[1] & 0x3F);
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129 return(1);
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130 case 3:
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131 unicode = ((utf8_buf[0] & 0x0F) << 12) |
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132 ((utf8_buf[1] & 0x3F) << 6) | (utf8_buf[2] & 0x3F);
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133 if (unicode & 0xF800)
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134 return(1);
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135 else
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136 return(0);
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137 case 4:
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138 unicode = ((utf8_buf[0] & 0x07) << 18) |
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139 ((utf8_buf[1] & 0x3F) << 12) |
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140 ((utf8_buf[2] & 0x3F) << 6) | (utf8_buf[3] & 0x3F);
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141 if (unicode & 0x1F0000)
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142 return(1);
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143 else
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144 return(0);
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145 default:
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146 return(0);
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147 }
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148 }
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149
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150 static void
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151 unicode_out()
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152 {
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 char buf[9];
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 if (unicode >= 0x10000)
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 sprintf(buf, "\\U%06u", unicode);
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 else
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 sprintf(buf, "\\u%04u", unicode);
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 unit_output(buf);
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 }
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162 static void
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163 flush_first_pass_state()
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164 {
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
165 unsigned n;
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
166
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
167 switch (first_pass_state) {
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
168 case FPS_CR:
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
169 regular_byte('\r');
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
170 break;
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
171 case FPS_UTF8:
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
172 for (n = 0; n < utf8_wptr; n++)
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
173 regular_byte(utf8_buf[n]);
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
174 break;
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
175 }
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
176 first_pass_state = FPS_GROUND;
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
177 }
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
178
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
179 static void
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
180 first_pass(ch)
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
181 {
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
182 if (first_pass_state == FPS_CR && ch == '\n') {
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
183 first_pass_state = FPS_GROUND;
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
184 newline_out();
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
185 return;
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
186 }
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
187 if (first_pass_state == FPS_UTF8 && ch >= 0x80 && ch <= 0xBF) {
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
188 utf8_buf[utf8_wptr++] = ch;
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
189 if (utf8_wptr < utf8_nbytes)
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
190 return;
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
191 if (utf8_collect()) {
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
192 first_pass_state = FPS_GROUND;
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
193 unicode_out();
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
194 return;
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
195 }
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
196 }
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
197 flush_first_pass_state();
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
198 switch (ch) {
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
199 case '\n':
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
200 newline_out();
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
201 return;
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
202 case '\r':
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
203 first_pass_state = FPS_CR;
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
204 return;
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
205 }
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
206 if (!text_is_utf8 || ch < 0xC2 || ch > 0xF7) {
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
207 regular_byte(ch);
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
208 return;
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
209 }
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
210 first_pass_state = FPS_UTF8;
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
211 utf8_buf[0] = ch;
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
212 utf8_wptr = 1;
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
213 if (ch < 0xE0)
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
214 utf8_nbytes = 2;
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
215 else if (ch < 0xF0)
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
216 utf8_nbytes = 3;
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
217 else
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
218 utf8_nbytes = 4;
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
219 }
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
220
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
221 void
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
222 ptext_conv_init()
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
223 {
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
224 dec_outf = first_pass;
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
225 ptext_has_backslash = 0;
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
226 ptext_has_linesplit = 0;
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
227 first_pass_state = FPS_GROUND;
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
228 out_line_len = 0;
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
229 trailing_newline = 1;
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
230 }
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
231
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
232 void
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
233 ptext_conv_finish()
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
234 {
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
235 flush_first_pass_state();
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
236 while (trailing_newline < 2) {
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
237 putc('\n', tempfile);
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
238 trailing_newline++;
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
239 }
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
240 }