[Emacs-diffs] Changes to emacs/lib-src/fakemail.c [lexbind]

[Miles Bader]

Index: emacs/lib-src/fakemail.c
diff -c /dev/null emacs/lib-src/fakemail.c:1.30.4.1
*** /dev/null   Tue Oct 14 19:59:23 2003
--- emacs/lib-src/fakemail.c    Tue Oct 14 19:59:13 2003
***************
*** 0 ****
--- 1,755 ----
+ /* sendmail-like interface to /bin/mail for system V,
+    Copyright (C) 1985, 1994, 1999 Free Software Foundation, Inc.
+ 
+ This file is part of GNU Emacs.
+ 
+ GNU Emacs is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+ 
+ GNU Emacs is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU General Public License for more details.
+ 
+ You should have received a copy of the GNU General Public License
+ along with GNU Emacs; see the file COPYING.  If not, write to
+ the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA.  */
+ 
+ #define NO_SHORTNAMES
+ #define _XOPEN_SOURCE 500     /* for cuserid */
+ 
+ #ifdef HAVE_CONFIG_H
+ #include <config.h>
+ #endif
+ 
+ #if defined (BSD_SYSTEM) && !defined (BSD4_1) && !defined (USE_FAKEMAIL)
+ /* This program isnot used in BSD, so just avoid loader complaints.  */
+ int
+ main ()
+ {
+   return 0;
+ }
+ #else /* not BSD 4.2 (or newer) */
+ #ifdef MSDOS
+ int
+ main ()
+ {
+   return 0;
+ }
+ #else /* not MSDOS */
+ /* This conditional contains all the rest of the file.  */
+ 
+ /* These are defined in config in some versions. */
+ 
+ #ifdef static
+ #undef static
+ #endif
+ 
+ #ifdef WINDOWSNT
+ #include "ntlib.h"
+ #endif
+ 
+ #include <stdio.h>
+ #include <string.h>
+ #include <ctype.h>
+ #include <time.h>
+ #include <pwd.h>
+ 
+ /* This is to declare cuserid.  */
+ #ifdef HAVE_UNISTD_H
+ #include <unistd.h>
+ #endif
+ 
+ /* Type definitions */
+ 
+ #define boolean int
+ #define true 1
+ #define false 0
+ 
+ /* Various lists */
+ 
+ struct line_record
+ {
+   char *string;
+   struct line_record *continuation;
+ };
+ typedef struct line_record *line_list;
+ 
+ struct header_record
+ {
+   line_list text;
+   struct header_record *next;
+   struct header_record *previous;
+ };
+ typedef struct header_record *header;
+ 
+ struct stream_record
+ {
+   FILE *handle;
+   int (*action)();
+   struct stream_record *rest_streams;
+ };
+ typedef struct stream_record *stream_list;
+ 
+ /* A `struct linebuffer' is a structure which holds a line of text.
+  * `readline' reads a line from a stream into a linebuffer
+  * and works regardless of the length of the line.
+  */
+ 
+ struct linebuffer
+ {
+   long size;
+   char *buffer;
+ };
+ 
+ struct linebuffer lb;
+ 
+ #define new_list()                                    \
+   ((line_list) xmalloc (sizeof (struct line_record)))
+ #define new_header()                          \
+   ((header) xmalloc (sizeof (struct header_record)))
+ #define new_stream()                          \
+   ((stream_list) xmalloc (sizeof (struct stream_record)))
+ #define alloc_string(nchars)                          \
+   ((char *) xmalloc ((nchars) + 1))
+ 
+ /* Global declarations */
+ 
+ #define BUFLEN 1024
+ #define KEYWORD_SIZE 256
+ #define FROM_PREFIX "From"
+ #define MY_NAME "fakemail"
+ #define NIL ((line_list) NULL)
+ #define INITIAL_LINE_SIZE 200
+ 
+ #ifndef MAIL_PROGRAM_NAME
+ #define MAIL_PROGRAM_NAME "/bin/mail"
+ #endif
+ 
+ static char *my_name;
+ static char *the_date;
+ static char *the_user;
+ static line_list file_preface;
+ static stream_list the_streams;
+ static boolean no_problems = true;
+ 
+ extern FILE *popen ();
+ extern int fclose (), pclose ();
+ 
+ #ifdef CURRENT_USER
+ extern struct passwd *getpwuid ();
+ extern unsigned short geteuid ();
+ static struct passwd *my_entry;
+ #define cuserid(s)                            \
+ (my_entry = getpwuid (((int) geteuid ())),    \
+  my_entry->pw_name)
+ #endif
+ 
+ /* Utilities */
+ 
+ /* Print error message.  `s1' is printf control string, `s2' is arg for it. */
+ 
+ static void
+ error (s1, s2)
+      char *s1, *s2;
+ {
+   printf ("%s: ", my_name);
+   printf (s1, s2);
+   printf ("\n");
+   no_problems = false;
+ }
+ 
+ /* Print error message and exit.  */
+ 
+ static void
+ fatal (s1, s2)
+      char *s1, *s2;
+ {
+   error (s1, s2);
+   exit (1);
+ }
+ 
+ /* Like malloc but get fatal error if memory is exhausted.  */
+ 
+ static long *
+ xmalloc (size)
+      int size;
+ {
+   long *result = (long *) malloc (((unsigned) size));
+   if (result == ((long *) NULL))
+     fatal ("virtual memory exhausted", 0);
+   return result;
+ }
+ 
+ static long *
+ xrealloc (ptr, size)
+      long *ptr;
+      int size;
+ {
+   long *result = (long *) realloc (ptr, ((unsigned) size));
+   if (result == ((long *) NULL))
+     fatal ("virtual memory exhausted");
+   return result;
+ }
+ 
+ /* Initialize a linebuffer for use */
+ 
+ void
+ init_linebuffer (linebuffer)
+      struct linebuffer *linebuffer;
+ {
+   linebuffer->size = INITIAL_LINE_SIZE;
+   linebuffer->buffer = ((char *) xmalloc (INITIAL_LINE_SIZE));
+ }
+ 
+ /* Read a line of text from `stream' into `linebuffer'.
+    Return the length of the line.  */
+ 
+ long
+ readline (linebuffer, stream)
+      struct linebuffer *linebuffer;
+      FILE *stream;
+ {
+   char *buffer = linebuffer->buffer;
+   char *p = linebuffer->buffer;
+   char *end = p + linebuffer->size;
+ 
+   while (true)
+     {
+       int c = getc (stream);
+       if (p == end)
+       {
+         linebuffer->size *= 2;
+         buffer = ((char *) xrealloc ((long *)buffer, linebuffer->size));
+         p = buffer + (p - linebuffer->buffer);
+         end = buffer + linebuffer->size;
+         linebuffer->buffer = buffer;
+       }
+       if (c < 0 || c == '\n')
+       {
+         *p = 0;
+         break;
+       }
+       *p++ = c;
+     }
+ 
+   return p - buffer;
+ }
+ 
+ /* Extract a colon-terminated keyword from the string FIELD.
+    Return that keyword as a string stored in a static buffer.
+    Store the address of the rest of the string into *REST.
+ 
+    If there is no keyword, return NULL and don't alter *REST.  */
+ 
+ char *
+ get_keyword (field, rest)
+      register char *field;
+      char **rest;
+ {
+   static char keyword[KEYWORD_SIZE];
+   register char *ptr;
+   register int c;
+ 
+   ptr = &keyword[0];
+   c = (unsigned char) *field++;
+   if (isspace (c) || c == ':')
+     return ((char *) NULL);
+   *ptr++ = (islower (c) ? toupper (c) : c);
+   while (((c = (unsigned char) *field++) != ':') && ! isspace (c))
+     *ptr++ = (islower (c) ? toupper (c) : c);
+   *ptr++ = '\0';
+   while (isspace (c))
+     c = (unsigned char) *field++;
+   if (c != ':')
+     return ((char *) NULL);
+   *rest = field;
+   return &keyword[0];
+ }
+ 
+ /* Nonzero if the string FIELD starts with a colon-terminated keyword.  */
+ 
+ boolean
+ has_keyword (field)
+      char *field;
+ {
+   char *ignored;
+   return (get_keyword (field, &ignored) != ((char *) NULL));
+ }
+ 
+ /* Store the string FIELD, followed by any lines in THE_LIST,
+    into the buffer WHERE.
+    Concatenate lines, putting just a space between them.
+    Delete everything contained in parentheses.
+    When a recipient name contains <...>, we discard
+    everything except what is inside the <...>.
+ 
+    We don't pay attention to overflowing WHERE;
+    the caller has to make it big enough.  */
+ 
+ char *
+ add_field (the_list, field, where)
+      line_list the_list;
+      register char *field, *where;
+ {
+   register char c;
+   while (true)
+     {
+       char *this_recipient_where;
+       int in_quotes = 0;
+ 
+       *where++ = ' ';
+       this_recipient_where = where;
+ 
+       while ((c = *field++) != '\0')
+       {
+         if (c == '\\')
+           *where++ = c;
+         else if (c == '"')
+           {
+             in_quotes = ! in_quotes;
+             *where++ = c;
+           }
+         else if (in_quotes)
+           *where++ = c;
+         else if (c == '(')
+           {
+             while (*field && *field != ')') ++field;
+             if (! (*field++)) break; /* no close */
+             continue;
+           }
+         else if (c == ',')
+           {
+             *where++ = ' ';
+             /* When we get to the end of one recipient,
+                don't discard it if the next one has <...>.  */
+             this_recipient_where = where;
+           }
+         else if (c == '<')
+           /* Discard everything we got before the `<'.  */
+           where = this_recipient_where;
+         else if (c == '>')
+           /* Discard the rest of this name that follows the `>'.  */
+           {
+             while (*field && *field != ',') ++field;
+             if (! (*field++)) break; /* no comma */
+             continue;
+           }
+         else
+           *where++ = c;
+       }
+       if (the_list == NIL) break;
+       field = the_list->string;
+       the_list = the_list->continuation;
+     }
+   return where;
+ }
+ 
+ line_list
+ make_file_preface ()
+ {
+   char *the_string, *temp;
+   long idiotic_interface;
+   long prefix_length;
+   long user_length;
+   long date_length;
+   line_list result;
+ 
+   prefix_length = strlen (FROM_PREFIX);
+   time (&idiotic_interface);
+   the_date = ctime (&idiotic_interface);
+   /* the_date has an unwanted newline at the end */
+   date_length = strlen (the_date) - 1;
+   the_date[date_length] = '\0';
+   temp = cuserid ((char *) NULL);
+   user_length = strlen (temp);
+   the_user = alloc_string (user_length + 1);
+   strcpy (the_user, temp);
+   the_string = alloc_string (3 + prefix_length
+                            + user_length
+                            + date_length);
+   temp = the_string;
+   strcpy (temp, FROM_PREFIX);
+   temp = &temp[prefix_length];
+   *temp++ = ' ';
+   strcpy (temp, the_user);
+   temp = &temp[user_length];
+   *temp++ = ' ';
+   strcpy (temp, the_date);
+   result = new_list ();
+   result->string = the_string;
+   result->continuation = ((line_list) NULL);
+   return result;
+ }
+ 
+ void
+ write_line_list (the_list, the_stream)
+      register line_list the_list;
+      FILE *the_stream;
+ {
+   for ( ;
+       the_list != ((line_list) NULL) ;
+       the_list = the_list->continuation)
+     {
+       fputs (the_list->string, the_stream);
+       putc ('\n', the_stream);
+     }
+   return;
+ }
+ 
+ int
+ close_the_streams ()
+ {
+   register stream_list rem;
+   for (rem = the_streams;
+        rem != ((stream_list) NULL);
+        rem = rem->rest_streams)
+     no_problems = (no_problems &&
+                  ((*rem->action) (rem->handle) == 0));
+   the_streams = ((stream_list) NULL);
+   return (no_problems ? 0 : 1);
+ }
+ 
+ void
+ add_a_stream (the_stream, closing_action)
+      FILE *the_stream;
+      int (*closing_action)();
+ {
+   stream_list old = the_streams;
+   the_streams = new_stream ();
+   the_streams->handle = the_stream;
+   the_streams->action = closing_action;
+   the_streams->rest_streams = old;
+   return;
+ }
+ 
+ int
+ my_fclose (the_file)
+      FILE *the_file;
+ {
+   putc ('\n', the_file);
+   fflush (the_file);
+   return fclose (the_file);
+ }
+ 
+ boolean
+ open_a_file (name)
+      char *name;
+ {
+   FILE *the_stream = fopen (name, "a");
+   if (the_stream != ((FILE *) NULL))
+     {
+       add_a_stream (the_stream, my_fclose);
+       if (the_user == ((char *) NULL))
+       file_preface = make_file_preface ();
+       write_line_list (file_preface, the_stream);
+       return true;
+     }
+   return false;
+ }
+ 
+ void
+ put_string (s)
+      char *s;
+ {
+   register stream_list rem;
+   for (rem = the_streams;
+        rem != ((stream_list) NULL);
+        rem = rem->rest_streams)
+     fputs (s, rem->handle);
+   return;
+ }
+ 
+ void
+ put_line (string)
+      char *string;
+ {
+   register stream_list rem;
+   for (rem = the_streams;
+        rem != ((stream_list) NULL);
+        rem = rem->rest_streams)
+     {
+       char *s = string;
+       int column = 0;
+ 
+       /* Divide STRING into lines.  */
+       while (*s != 0)
+       {
+         char *breakpos;
+ 
+         /* Find the last char that fits.  */
+         for (breakpos = s; *breakpos && column < 78; ++breakpos)
+           {
+             if (*breakpos == '\t')
+               column += 8;
+             else
+               column++;
+           }
+         /* If we didn't reach end of line, break the line.  */
+         if (*breakpos)
+           {
+             /* Back up to just after the last comma that fits.  */
+             while (breakpos != s && breakpos[-1] != ',') --breakpos;
+ 
+             if (breakpos == s)
+               {
+                 /* If no comma fits, move past the first address anyway.  */
+                 while (*breakpos != 0 && *breakpos != ',') ++breakpos;
+                 if (*breakpos != 0)
+                   /* Include the comma after it.  */
+                   ++breakpos;
+               }
+           }
+         /* Output that much, then break the line.  */
+         fwrite (s, 1, breakpos - s, rem->handle);
+         column = 8;
+ 
+         /* Skip whitespace and prepare to print more addresses.  */
+         s = breakpos;
+         while (*s == ' ' || *s == '\t') ++s;
+           if (*s != 0)
+           fputs ("\n\t", rem->handle);
+       }
+       putc ('\n', rem->handle);
+     }
+   return;
+ }
+ 
+ #define mail_error error
+ 
+ /* Handle an FCC field.  FIELD is the text of the first line (after
+    the header name), and THE_LIST holds the continuation lines if any.
+    Call open_a_file for each file.  */
+ 
+ void
+ setup_files (the_list, field)
+      register line_list the_list;
+      register char *field;
+ {
+   register char *start;
+   register char c;
+   while (true)
+     {
+       while (((c = *field) != '\0')
+            && (c == ' '
+                || c == '\t'
+                || c == ','))
+       field += 1;
+       if (c != '\0')
+       {
+         start = field;
+         while (((c = *field) != '\0')
+                && c != ' '
+                && c != '\t'
+                && c != ',')
+           field += 1;
+         *field = '\0';
+         if (!open_a_file (start))
+           mail_error ("Could not open file %s", start);
+         *field = c;
+         if (c != '\0') continue;
+       }
+       if (the_list == ((line_list) NULL))
+       return;
+       field = the_list->string;
+       the_list = the_list->continuation;
+     }
+ }
+ 
+ /* Compute the total size of all recipient names stored in THE_HEADER.
+    The result says how big to make the buffer to pass to parse_header.  */
+ 
+ int
+ args_size (the_header)
+      header the_header;
+ {
+   register header old = the_header;
+   register line_list rem;
+   register int size = 0;
+   do
+     {
+       char *field;
+       register char *keyword = get_keyword (the_header->text->string, &field);
+       if ((strcmp (keyword, "TO") == 0)
+         || (strcmp (keyword, "CC") == 0)
+         || (strcmp (keyword, "BCC") == 0))
+       {
+         size += 1 + strlen (field);
+         for (rem = the_header->text->continuation;
+              rem != NIL;
+              rem = rem->continuation)
+           size += 1 + strlen (rem->string);
+       }
+       the_header = the_header->next;
+     } while (the_header != old);
+   return size;
+ }
+ 
+ /* Scan the header described by the lists THE_HEADER,
+    and put all recipient names into the buffer WHERE.
+    Precede each recipient name with a space.
+ 
+    Also, if the header has any FCC fields, call setup_files for each one.  */
+ 
+ void
+ parse_header (the_header, where)
+      header the_header;
+      register char *where;
+ {
+   register header old = the_header;
+   do
+     {
+       char *field;
+       register char *keyword = get_keyword (the_header->text->string, &field);
+       if (strcmp (keyword, "TO") == 0)
+       where = add_field (the_header->text->continuation, field, where);
+       else if (strcmp (keyword, "CC") == 0)
+       where = add_field (the_header->text->continuation, field, where);
+       else if (strcmp (keyword, "BCC") == 0)
+       {
+         where = add_field (the_header->text->continuation, field, where);
+         the_header->previous->next = the_header->next;
+         the_header->next->previous = the_header->previous;
+       }
+       else if (strcmp (keyword, "FCC") == 0)
+       setup_files (the_header->text->continuation, field);
+       the_header = the_header->next;
+     } while (the_header != old);
+   *where = '\0';
+   return;
+ }
+ 
+ /* Read lines from the input until we get a blank line.
+    Create a list of `header' objects, one for each header field,
+    each of which points to a list of `line_list' objects,
+    one for each line in that field.
+    Continuation lines are grouped in the headers they continue.  */
+ 
+ header
+ read_header ()
+ {
+   register header the_header = ((header) NULL);
+   register line_list *next_line = ((line_list *) NULL);
+ 
+   init_linebuffer (&lb);
+ 
+   do
+     {
+       long length;
+       register char *line;
+ 
+       readline (&lb, stdin);
+       line = lb.buffer;
+       length = strlen (line);
+       if (length == 0) break;
+ 
+       if (has_keyword (line))
+       {
+         register header old = the_header;
+         the_header = new_header ();
+         if (old == ((header) NULL))
+           {
+             the_header->next = the_header;
+             the_header->previous = the_header;
+           }
+         else
+           {
+             the_header->previous = old;
+             the_header->next = old->next;
+             old->next = the_header;
+           }
+         next_line = &(the_header->text);
+       }
+ 
+       if (next_line == ((line_list *) NULL))
+       {
+         /* Not a valid header */
+         exit (1);
+       }
+       *next_line = new_list ();
+       (*next_line)->string = alloc_string (length);
+       strcpy (((*next_line)->string), line);
+       next_line = &((*next_line)->continuation);
+       *next_line = NIL;
+ 
+     } while (true);
+ 
+   return the_header->next;
+ }
+ 
+ void
+ write_header (the_header)
+      header the_header;
+ {
+   register header old = the_header;
+   do
+     {
+       register line_list the_list;
+       for (the_list = the_header->text;
+          the_list != NIL;
+          the_list = the_list->continuation)
+       put_line (the_list->string);
+       the_header = the_header->next;
+     } while (the_header != old);
+   put_line ("");
+   return;
+ }
+ 
+ int
+ main (argc, argv)
+      int argc;
+      char **argv;
+ {
+   char *command_line;
+   header the_header;
+   long name_length;
+   char *mail_program_name;
+   char buf[BUFLEN + 1];
+   register int size;
+   FILE *the_pipe;
+ 
+   extern char *getenv ();
+ 
+   mail_program_name = getenv ("FAKEMAILER");
+   if (!(mail_program_name && *mail_program_name))
+     mail_program_name = MAIL_PROGRAM_NAME;
+   name_length = strlen (mail_program_name);
+ 
+   my_name = MY_NAME;
+   the_streams = ((stream_list) NULL);
+   the_date = ((char *) NULL);
+   the_user = ((char *) NULL);
+ 
+   the_header = read_header ();
+   command_line = alloc_string (name_length + args_size (the_header));
+   strcpy (command_line, mail_program_name);
+   parse_header (the_header, &command_line[name_length]);
+ 
+   the_pipe = popen (command_line, "w");
+   if (the_pipe == ((FILE *) NULL))
+     fatal ("cannot open pipe to real mailer");
+ 
+   add_a_stream (the_pipe, pclose);
+ 
+   write_header (the_header);
+ 
+   /* Dump the message itself */
+ 
+   while (!feof (stdin))
+     {
+       size = fread (buf, 1, BUFLEN, stdin);
+       buf[size] = '\0';
+       put_string (buf);
+     }
+ 
+   exit (close_the_streams ());
+ }
+ 
+ #endif /* not MSDOS */
+ #endif /* not BSD 4.2 (or newer) */
+ 
+ /* arch-tag: acb0afa6-315a-4c5b-b9e3-def5725c8783
+    (do not change this comment) */