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annotate f-demime/main.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
parents
children 612c4d0df768
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7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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Mychaela Falconia <falcon@freecalypso.org>
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2 * This module contains the main() function for f-demime. The following
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Mychaela Falconia <falcon@freecalypso.org>
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3 * functions are called to pass input to further processing:
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Mychaela Falconia <falcon@freecalypso.org>
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4 *
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Mychaela Falconia <falcon@freecalypso.org>
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5 * begin_new_message(): called after processing a "From " line
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Mychaela Falconia <falcon@freecalypso.org>
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6 * message_input_line(): called for all message lines after the "From " line
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Mychaela Falconia <falcon@freecalypso.org>
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7 * finish_msg_body(): called when hitting EOF or a new "From " line
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Mychaela Falconia <falcon@freecalypso.org>
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8 */
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Mychaela Falconia <falcon@freecalypso.org>
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9
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10 #include <stdio.h>
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11 #include <stdlib.h>
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12 #include <string.h>
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Mychaela Falconia <falcon@freecalypso.org>
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13 #include <strings.h>
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14 #include <time.h>
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15 #include "defs.h"
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16
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17 char *att_filename_buf, *att_filename_base, *att_filename_tail;
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18 unsigned input_lineno;
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19
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20 static void
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Mychaela Falconia <falcon@freecalypso.org>
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21 get_attachment_dir()
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Mychaela Falconia <falcon@freecalypso.org>
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22 {
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Mychaela Falconia <falcon@freecalypso.org>
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23 static char varname[] = "FDEMIME_ATT_DIR";
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24 char *env, *cp;
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25 unsigned dir_name_len;
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26 time_t curtime;
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27 struct tm *tm;
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28
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29 env = getenv(varname);
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30 if (!env) {
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31 fprintf(stderr,
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Mychaela Falconia <falcon@freecalypso.org>
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32 "error: required environment variable %s is not set\n",
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33 varname);
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34 exit(1);
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Mychaela Falconia <falcon@freecalypso.org>
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35 }
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36 if (!env[0]) {
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37 fprintf(stderr,
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Mychaela Falconia <falcon@freecalypso.org>
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38 "error: empty string value for %s is not allowed\n",
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39 varname);
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40 exit(1);
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41 }
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42 dir_name_len = strlen(env);
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43 att_filename_buf = malloc(dir_name_len + 31); /* Y10K extra margin */
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44 if (!att_filename_buf) {
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45 fprintf(stderr,
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46 "error: unable to malloc buffer for attachment filenames\n");
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Mychaela Falconia <falcon@freecalypso.org>
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47 exit(1);
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48 }
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Mychaela Falconia <falcon@freecalypso.org>
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49 strcpy(att_filename_buf, env);
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50 cp = att_filename_buf + dir_name_len;
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Mychaela Falconia <falcon@freecalypso.org>
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51 *cp++ = '/';
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Mychaela Falconia <falcon@freecalypso.org>
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52 att_filename_base = cp;
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Mychaela Falconia <falcon@freecalypso.org>
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53 time(&curtime);
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Mychaela Falconia <falcon@freecalypso.org>
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54 tm = gmtime(&curtime);
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Mychaela Falconia <falcon@freecalypso.org>
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55 sprintf(cp, "%u%02u%02ua", tm->tm_year + 1900, tm->tm_mon + 1,
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56 tm->tm_mday);
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57 att_filename_tail = index(cp, '\0');
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58 }
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Mychaela Falconia <falcon@freecalypso.org>
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59
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Mychaela Falconia <falcon@freecalypso.org>
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60 main(argc, argv)
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61 char **argv;
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62 {
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Mychaela Falconia <falcon@freecalypso.org>
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63 char linebuf[LINE_BUF_SIZE], *cp;
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Mychaela Falconia <falcon@freecalypso.org>
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64
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65 if (argc > 3) {
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66 fprintf(stderr, "usage: %s [infile [outfile]]\n", argv[0]);
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67 exit(1);
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68 }
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69 get_attachment_dir();
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70 if (argc > 1 && !freopen(argv[1], "r", stdin)) {
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71 perror(argv[1]);
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72 exit(1);
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73 }
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74 if (argc > 2 && !freopen(argv[2], "w", stdout)) {
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75 perror(argv[2]);
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76 exit(1);
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Mychaela Falconia <falcon@freecalypso.org>
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77 }
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78 for (input_lineno = 1; fgets(linebuf, sizeof linebuf, stdin);
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79 input_lineno++) {
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80 cp = index(linebuf, '\n');
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81 if (cp) {
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82 *cp = '\0';
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83 if (cp > linebuf && cp[-1] == '\r')
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84 *--cp = '\0';
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85 } else {
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86 fprintf(stderr,
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87 "f-demime warning: input line %u too long or unterminated\n",
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88 input_lineno);
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89 }
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90 if (!strncmp(linebuf, "From ", 5)) {
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91 finish_msg_body();
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92 puts(linebuf);
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93 begin_new_message();
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Mychaela Falconia <falcon@freecalypso.org>
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94 continue;
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95 }
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Mychaela Falconia <falcon@freecalypso.org>
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96 message_input_line(linebuf);
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Mychaela Falconia <falcon@freecalypso.org>
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97 }
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98 finish_msg_body();
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99 exit(0);
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100 }