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0
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1 /*
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2 * b2m - a filter for Babyl -> Unix mail files
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3 *
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4 * usage: b2m < babyl > mailbox
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5 *
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6 * I find this useful whenever I have to use a
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7 * system which - shock horror! - doesn't run
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8 * Gnu emacs. At least now I can read all my
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9 * Gnumacs Babyl format mail files!
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10 *
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11 * it's not much but it's free!
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12 *
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13 * Ed Wilkinson
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14 * E.Wilkinson@massey.ac.nz
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15 * Mon Nov 7 15:54:06 PDT 1988
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16 */
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17
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146
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18 /* Made conformant to the GNU coding standards January, 1995
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19 by Francesco Potorti` <pot@cnuce.cnr.it>. */
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0
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20
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21 #include <stdio.h>
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22 #include <time.h>
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23 #include <sys/types.h>
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24 #ifdef MSDOS
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25 #include <fcntl.h>
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26 #endif
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27
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146
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28 #ifdef HAVE_CONFIG_H
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29 #include <config.h>
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30 /* On some systems, Emacs defines static as nothing for the sake
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31 of unexec. We don't want that here since we don't use unexec. */
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32 #undef static
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33 #endif
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34
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35 #undef TRUE
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36 #define TRUE 1
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37 #undef FALSE
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38 #define FALSE 0
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39
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40 /* Exit codes for success and failure. */
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41 #ifdef VMS
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42 #define GOOD 1
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43 #define BAD 0
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44 #else
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45 #define GOOD 0
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46 #define BAD 1
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47 #endif
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48
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49 #define streq(s,t) (strcmp (s, t) == 0)
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50 #define strneq(s,t,n) (strncmp (s, t, n) == 0)
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0
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51
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146
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52 typedef int logical;
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0
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53
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146
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54 /*
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55 * A `struct linebuffer' is a structure which holds a line of text.
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56 * `readline' reads a line from a stream into a linebuffer and works
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57 * regardless of the length of the line.
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58 */
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59 struct linebuffer
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60 {
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61 long size;
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62 char *buffer;
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63 };
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64
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65 extern char *strtok();
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66
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67 long *xmalloc (), *xrealloc ();
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68 char *concat ();
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69 long readline ();
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70 void fatal ();
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71
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72 /*
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73 * xnew -- allocate storage. SYNOPSIS: Type *xnew (int n, Type);
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74 */
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75 #define xnew(n, Type) ((Type *) xmalloc ((n) * sizeof (Type)))
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0
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76
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77
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146
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78
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79 char *progname;
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0
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80
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146
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81 main (argc, argv)
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82 int argc;
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83 char **argv;
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84 {
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85 logical labels_saved, printing, header;
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86 time_t ltoday;
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87 char *labels, *p, *today;
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88 struct linebuffer data;
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0
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89
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90 #ifdef MSDOS
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91 _fmode = O_BINARY; /* all of files are treated as binary files */
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146
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92 #if __DJGPP__ > 1
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93 if (!isatty (fileno (stdout)))
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94 setmode (fileno (stdout), O_BINARY);
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95 if (!isatty (fileno (stdin)))
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96 setmode (fileno (stdin), O_BINARY);
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97 #else /* not __DJGPP__ > 1 */
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0
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98 (stdout)->_flag &= ~_IOTEXT;
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99 (stdin)->_flag &= ~_IOTEXT;
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146
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100 #endif /* not __DJGPP__ > 1 */
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0
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101 #endif
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146
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102 progname = argv[0];
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103
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104 if (argc != 1)
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0
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105 {
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146
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106 fprintf (stderr, "Usage: %s <babylmailbox >unixmailbox\n", progname);
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107 exit (GOOD);
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0
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108 }
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146
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109 labels_saved = printing = header = FALSE;
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0
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110 ltoday = time (0);
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111 today = ctime (<oday);
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146
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112 data.size = 200;
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113 data.buffer = xnew (200, char);
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0
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114
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146
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115 if (readline (&data, stdin) == 0
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116 || !strneq (data.buffer, "BABYL OPTIONS:", 14))
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117 fatal ("standard input is not a Babyl mailfile.");
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118
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119 while (readline (&data, stdin) > 0)
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0
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120 {
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146
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121 if (streq (data.buffer, "*** EOOH ***") && !printing)
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0
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122 {
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123 printing = header = TRUE;
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146
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124 printf ("From \"Babyl to mail by %s\" %s", progname, today);
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0
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125 continue;
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126 }
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127
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146
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128 if (data.buffer[0] == '\037')
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0
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129 {
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146
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130 if (data.buffer[1] == '\0')
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131 continue;
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132 else if (data.buffer[1] == '\f')
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133 {
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134 /* Save labels. */
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135 readline (&data, stdin);
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136 p = strtok (data.buffer, " ,\r\n\t");
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137 labels = "X-Babyl-Labels: ";
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138
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139 while (p = strtok (NULL, " ,\r\n\t"))
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140 labels = concat (labels, p, ", ");
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0
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141
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146
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142 p = &labels[strlen (labels) - 2];
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143 if (*p == ',')
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144 *p = '\0';
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145 printing = header = FALSE;
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146 labels_saved = TRUE;
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147 continue;
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0
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148 }
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146
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149 }
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0
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150
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146
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151 if ((data.buffer[0] == '\0') && header)
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152 {
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153 header = FALSE;
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154 if (labels_saved)
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155 puts (labels);
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0
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156 }
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157
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158 if (printing)
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146
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159 puts (data.buffer);
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0
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160 }
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161 }
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146
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162
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163
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164
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165 /*
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166 * Return a newly-allocated string whose contents
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167 * concatenate those of s1, s2, s3.
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168 */
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169 char *
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170 concat (s1, s2, s3)
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171 char *s1, *s2, *s3;
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172 {
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173 int len1 = strlen (s1), len2 = strlen (s2), len3 = strlen (s3);
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174 char *result = xnew (len1 + len2 + len3 + 1, char);
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175
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176 strcpy (result, s1);
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177 strcpy (result + len1, s2);
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178 strcpy (result + len1 + len2, s3);
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179 result[len1 + len2 + len3] = '\0';
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180
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181 return result;
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182 }
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183
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184 /*
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185 * Read a line of text from `stream' into `linebuffer'.
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186 * Return the number of characters read from `stream',
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187 * which is the length of the line including the newline, if any.
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188 */
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189 long
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190 readline (linebuffer, stream)
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191 struct linebuffer *linebuffer;
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192 register FILE *stream;
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193 {
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194 char *buffer = linebuffer->buffer;
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195 register char *p = linebuffer->buffer;
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196 register char *pend;
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197 int chars_deleted;
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198
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199 pend = p + linebuffer->size; /* Separate to avoid 386/IX compiler bug. */
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200
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201 while (1)
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202 {
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203 register int c = getc (stream);
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204 if (p == pend)
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205 {
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206 linebuffer->size *= 2;
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207 buffer = (char *) xrealloc (buffer, linebuffer->size);
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208 p += buffer - linebuffer->buffer;
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209 pend = buffer + linebuffer->size;
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210 linebuffer->buffer = buffer;
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211 }
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212 if (c == EOF)
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213 {
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214 chars_deleted = 0;
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215 break;
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216 }
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217 if (c == '\n')
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218 {
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219 if (p[-1] == '\r' && p > buffer)
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220 {
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221 *--p = '\0';
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222 chars_deleted = 2;
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223 }
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224 else
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225 {
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226 *p = '\0';
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227 chars_deleted = 1;
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228 }
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229 break;
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230 }
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231 *p++ = c;
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232 }
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233
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234 return (p - buffer + chars_deleted);
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235 }
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236
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237 /*
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238 * Like malloc but get fatal error if memory is exhausted.
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239 */
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240 long *
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241 xmalloc (size)
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242 unsigned int size;
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243 {
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244 long *result = (long *) malloc (size);
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245 if (result == NULL)
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246 fatal ("virtual memory exhausted");
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247 return result;
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248 }
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249
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250 long *
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251 xrealloc (ptr, size)
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252 char *ptr;
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253 unsigned int size;
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254 {
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255 long *result = (long *) realloc (ptr, size);
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256 if (result == NULL)
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257 fatal ("virtual memory exhausted");
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258 return result;
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259 }
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260
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261 void
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262 fatal (message)
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263 {
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264 fprintf (stderr, "%s: %s\n", progname, message);
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265 exit (BAD);
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266 }
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267
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