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428
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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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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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20
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21 #ifdef HAVE_CONFIG_H
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438
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22 #include <config.h>
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428
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23 /* On some systems, Emacs defines static as nothing for the sake
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24 of unexec. We don't want that here since we don't use unexec. */
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25 #undef static
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26 #endif
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27
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28 #include <stdio.h>
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29 #include <stdlib.h>
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30 #include <string.h>
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31 #include <time.h>
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32 #include <sys/types.h>
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33 #ifdef MSDOS
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34 #include <fcntl.h>
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35 #endif
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36
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37 #undef TRUE
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38 #define TRUE 1
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39 #undef FALSE
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40 #define FALSE 0
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41
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42 /* Exit codes for success and failure. */
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43 #ifdef VMS
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44 #define GOOD 1
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45 #define BAD 0
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46 #else
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47 #define GOOD 0
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48 #define BAD 1
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49 #endif
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50
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51 #define streq(s,t) (strcmp (s, t) == 0)
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52 #define strneq(s,t,n) (strncmp (s, t, n) == 0)
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53
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54 typedef int logical;
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55
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56 /*
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57 * A `struct linebuffer' is a structure which holds a line of text.
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58 * `readline' reads a line from a stream into a linebuffer and works
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59 * regardless of the length of the line.
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60 */
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61 struct linebuffer
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62 {
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63 long size;
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64 char *buffer;
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65 };
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66
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67
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68 static long *xmalloc (unsigned int);
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69 static long *xrealloc (void *, unsigned int);
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70 static char *concat (char *s1, char *s2, char *s3);
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71 static long readline (struct linebuffer *, FILE *);
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72 static void fatal (char *);
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73
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74 /*
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75 * xnew -- allocate storage. SYNOPSIS: Type *xnew (int n, Type);
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76 */
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77 #define xnew(n, Type) ((Type *) xmalloc ((n) * sizeof (Type)))
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78
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79
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80
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81 char *progname;
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82
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83 int
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84 main (int argc, char *argv[])
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85 {
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86 logical labels_saved, printing, header;
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87 time_t ltoday;
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88 char *labels = NULL, *p, *today;
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89 struct linebuffer data;
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90
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91 #ifdef MSDOS
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92 _fmode = O_BINARY; /* all of files are treated as binary files */
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93 #if __DJGPP__ > 1
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94 if (!isatty (fileno (stdout)))
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95 setmode (fileno (stdout), O_BINARY);
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96 if (!isatty (fileno (stdin)))
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97 setmode (fileno (stdin), O_BINARY);
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98 #else /* not __DJGPP__ > 1 */
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99 (stdout)->_flag &= ~_IOTEXT;
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100 (stdin)->_flag &= ~_IOTEXT;
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101 #endif /* not __DJGPP__ > 1 */
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102 #endif
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103 progname = argv[0];
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104
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105 if (argc != 1)
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106 {
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107 fprintf (stderr, "Usage: %s <babylmailbox >unixmailbox\n", progname);
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108 exit (GOOD);
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109 }
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110 labels_saved = printing = header = FALSE;
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111 ltoday = time (0);
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112 today = ctime (<oday);
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113 data.size = 200;
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114 data.buffer = xnew (200, char);
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115
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116 if (readline (&data, stdin) == 0
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117 || !strneq (data.buffer, "BABYL OPTIONS:", 14))
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118 fatal ("standard input is not a Babyl mailfile.");
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119
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120 while (readline (&data, stdin) > 0)
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121 {
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122 if (streq (data.buffer, "*** EOOH ***") && !printing)
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123 {
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124 printing = header = TRUE;
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125 printf ("From \"Babyl to mail by %s\" %s", progname, today);
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126 continue;
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127 }
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128
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129 if (data.buffer[0] == '\037')
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130 {
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131 if (data.buffer[1] == '\0')
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132 continue;
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133 else if (data.buffer[1] == '\f')
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134 {
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135 /* Save labels. */
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136 readline (&data, stdin);
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137 p = strtok (data.buffer, " ,\r\n\t");
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138 labels = "X-Babyl-Labels: ";
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139
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140 while ((p = strtok (NULL, " ,\r\n\t")))
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141 labels = concat (labels, p, ", ");
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142
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143 p = &labels[strlen (labels) - 2];
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144 if (*p == ',')
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145 *p = '\0';
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146 printing = header = FALSE;
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147 labels_saved = TRUE;
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148 continue;
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149 }
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150 }
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151
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152 if ((data.buffer[0] == '\0') && header)
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153 {
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154 header = FALSE;
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155 if (labels_saved)
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156 puts (labels);
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157 }
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158
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159 if (printing)
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160 puts (data.buffer);
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161 }
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162 return 0;
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163 }
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164
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165
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166
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167 /*
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168 * Return a newly-allocated string whose contents
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169 * concatenate those of s1, s2, s3.
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170 */
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171 static char *
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172 concat (char *s1, char *s2, char *s3)
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173 {
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174 int len1 = strlen (s1), len2 = strlen (s2), len3 = strlen (s3);
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175 char *result = xnew (len1 + len2 + len3 + 1, char);
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176
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177 strcpy (result, s1);
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178 strcpy (result + len1, s2);
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179 strcpy (result + len1 + len2, s3);
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180 result[len1 + len2 + len3] = '\0';
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181
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182 return result;
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183 }
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184
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185 /*
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186 * Read a line of text from `stream' into `linebuffer'.
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187 * Return the number of characters read from `stream',
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188 * which is the length of the line including the newline, if any.
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189 */
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190 static long
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191 readline (struct linebuffer *linebuffer, FILE *stream)
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192 {
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193 char *buffer = linebuffer->buffer;
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194 register char *p = linebuffer->buffer;
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195 register char *pend;
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196 int chars_deleted;
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197
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198 pend = p + linebuffer->size; /* Separate to avoid 386/IX compiler bug. */
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199
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200 while (1)
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201 {
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202 register int c = getc (stream);
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203 if (p == pend)
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204 {
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205 linebuffer->size *= 2;
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206 buffer = (char *) xrealloc (buffer, linebuffer->size);
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207 p += buffer - linebuffer->buffer;
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208 pend = buffer + linebuffer->size;
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209 linebuffer->buffer = buffer;
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210 }
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211 if (c == EOF)
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212 {
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213 chars_deleted = 0;
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214 break;
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215 }
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216 if (c == '\n')
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217 {
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218 if (p[-1] == '\r' && p > buffer)
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219 {
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220 *--p = '\0';
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221 chars_deleted = 2;
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222 }
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223 else
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224 {
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225 *p = '\0';
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226 chars_deleted = 1;
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227 }
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228 break;
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229 }
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230 *p++ = c;
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231 }
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232
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233 return (p - buffer + chars_deleted);
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234 }
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235
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236 /*
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237 * Like malloc but get fatal error if memory is exhausted.
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238 */
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239 static long *
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240 xmalloc (unsigned int size)
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241 {
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242 long *result = (long *) malloc (size);
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243 if (result == NULL)
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244 fatal ("virtual memory exhausted");
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245 return result;
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246 }
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247
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248 static long *
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249 xrealloc (void *ptr, unsigned int size)
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250 {
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251 long *result = (long *) realloc (ptr, size);
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252 if (result == NULL)
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253 fatal ("virtual memory exhausted");
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254 return result;
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255 }
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256
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257 static void
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258 fatal (char *message)
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259 {
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260 fprintf (stderr, "%s: %s\n", progname, message);
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261 exit (BAD);
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262 }
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263
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