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comparison f-demime/b2q_out.c @ 0:7e0d08176f32

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f-demime starting code
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 06 May 2023 06:14:03 +0000
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-1:000000000000 0:7e0d08176f32
1 /*
2 * This module implements the output side of base64-to-QP conversion.
3 */
4
5 #include <stdio.h>
6 #include <stdlib.h>
7 #include <string.h>
8 #include <strings.h>
9 #include "defs.h"
10
11 extern FILE *tempfile;
12
13 static char linebuf[QP_MAX_LINE];
14 static unsigned line_len, trailing_newline;
15
16 static void
17 add_plain_char(ch)
18 {
19 linebuf[line_len++] = ch;
20 linebuf[line_len] = '\0';
21 if (!strcmp(linebuf, "From ")) {
22 strcpy(linebuf, "=46rom ");
23 line_len = 7;
24 } else if (!strcmp(linebuf, "--")) {
25 strcpy(linebuf, "=2D-");
26 line_len = 4;
27 } else if (!strcmp(linebuf, ".")) {
28 strcpy(linebuf, "=2E");
29 line_len = 3;
30 }
31 }
32
33 static void
34 add_octet_char(ch)
35 {
36 sprintf(linebuf + line_len, "=%02X", ch);
37 line_len += 3;
38 }
39
40 static void
41 process_newline()
42 {
43 if (line_len) {
44 if (linebuf[line_len-1] == ' ')
45 strcpy(linebuf + line_len - 1, "=20");
46 fputs(linebuf, stdout);
47 line_len = 0;
48 }
49 putchar('\n');
50 }
51
52 static void
53 process_char(ch)
54 {
55 if (ch == '\n') {
56 process_newline();
57 trailing_newline++;
58 if (trailing_newline > 2)
59 trailing_newline = 2;
60 return;
61 }
62 if (line_len >= QP_MAX_LINE - 2) {
63 printf("%s=\n", linebuf);
64 line_len = 0;
65 }
66 if (ch == '=')
67 add_octet_char(ch);
68 else if (ch >= ' ' && ch <= '~')
69 add_plain_char(ch);
70 else
71 add_octet_char(ch);
72 trailing_newline = 0;
73 }
74
75 void
76 b2q_emit_output()
77 {
78 int c;
79
80 rewind(tempfile);
81 line_len = 0;
82 trailing_newline = 1;
83 while ((c = getc(tempfile)) != EOF)
84 process_char(c);
85 fclose(tempfile);
86 while (trailing_newline < 2) {
87 process_newline();
88 trailing_newline++;
89 }
90 }