/*% c2latex -- converts C code with LaTeX comments into LaTeX input. % @(#)c2latex.c 1.1 91/01/16 % To create the documentation, compile this source file and feed this % source file into the resulting program. The output will be a file % that can be processed using LaTeX. \documentstyle{article} \newif\ifshowprogram % Set to true to include a listing of \showprogramtrue % the program. \newcommand{\ctolatex}{{\tt c2latex}} \newcommand{\MITREcopyright}{% Copyright \copyright{} 1991 by John D. Ramsdell. This program is free software; you can redistribute it and/or modify it under the terms of the MITRE Corporation General Public License as published by the MITRE Corporation; either version 1, or (at your option) any later version. This program is distributed in the hope that it will be useful, but {\em without any warranty;} without even the implied warranty of {\em merchantability} or {\em fitness for a particular purpose.} See the MITRE General Public License for more details. A copy of the MITRE General Public License has been included in the last comment of the C source file for \ctolatex{}. You also can obtain a copy by writing to the MITRE Corporation.} \title{\ctolatex} \author{John D. Ramsdell} \date{Version 1.1 of 91/01/16% } \begin{document} \maketitle \ctolatex\footnote{\MITREcopyright} provides simple support for literate programming in C\@. Given a C source file in which the comments have been written in \LaTeX{}, \ctolatex{} converts the C source file into a \LaTeX{} source file. It can be used to produce typeset listings of C programs and/or documentation associated with the program. The C source given to \ctolatex{} usually has the following form. It starts with a large comment containing \LaTeX{} commands that start a document along with any initial text. Then there is a sequence of comment and code pairs, with the comment explaining the code to follow. The source file is ended by a comment containing \LaTeX{} commands that finish the document. \ctolatex{} produces \LaTeX{} source by implementing a small number of rules. A C comment that starts at the beginning of a line is copied unmodified into the \LaTeX{} source file. Otherwise, non-blank lines are surrounded by a pair of formatting commands (\verb-\begin{flushleft}- and \verb-\end{flushleft}-), and the lines are separated by \verb-\\*-. Each non-blank line is formatted using \LaTeX's \verb-\verb- command, except comments within the line are formatted in an \verb-\mbox-. \ctolatex{} is invoked with the command: \begin{center}\tt \ctolatex{} [$\langle${\it C file name}$\rangle$ [$\langle${\it \LaTeX{} file name}$\rangle$]] \end{center} When $\langle${\it \LaTeX{} file name}$\rangle$ is omitted, the \LaTeX{} goes to standard output. When $\langle${\it C file name}$\rangle$ is omitted, C source is read from standard input, and the \LaTeX{} goes to standard output. This \LaTeX{} document was produced by using \ctolatex{} on its source file. */ /*\ifshowprogram*/ /* \newpage \section{Program listing} \ctolatex{} can be modified to handle \TeX{} macro packages other than \LaTeX{} by modifying the following strings and \verb-tex_putc-.*/ char *begin_comment = "%\\mbox{"; /* This pair is used */ char *end_comment = "}\\verb%"; /* to surround comments in code. */ char *begin_code = "\\begin{flushleft}\n"; /* This pair is used */ char *end_code = "\\end{flushleft}\n"; /* to surround code. */ char *code_line_separator = "\\\\* "; char *begin_code_line = "\\verb%"; /* This pair is used */ char *end_code_line = "%"; /* to surround code lines. */ /* The comment markers for C. */ char *comment_start = "/*"; /* Comment characters for */ char *comment_end = "*/"; /* the C source language. */ #include typedef enum {FALSE, TRUE} bool; void tex_putc(); void tex_puts(); /*\subsection{Filter} The routine {\tt filter} implements the main loop. By the time it is called, input comes from {\tt stdin} and output goes to {\tt stdout.} The loop is traversed for each line of input. The variable {\tt sp} contains a count of the number of previously seen spaces. This space count is required so that partial matches can be printed before the spaces when a code line is to be printed. */ int filter() { int c; char *match, *s; int sp = 0; /* Buffered space count. */ bool just_saw_code = FALSE; while (1) { c = match_string(comment_start, &match); if (*match == '\0') { /* Found a comment. */ if (just_saw_code) { fputs(end_code, stdout); just_saw_code = FALSE; } c = put_comment(c); /* Make sure nothing from */ match = comment_start; /* this match is printed. */ } for (sp = 0; c == ' '; sp++) /* Count white space */ c = getchar_xtab(); /* in case of code line. */ if (match == comment_start && (c == '\n' || c == EOF)) { if (just_saw_code) { /* Found blank line, */ fputs(end_code, stdout); /* or a comment which */ just_saw_code = FALSE; /* terminates a line. */ } } else { /* Found a code line. */ if (!just_saw_code) { fputs(begin_code, stdout); just_saw_code = TRUE; } else fputs(code_line_separator, stdout); fputs(begin_code_line, stdout); for (s = comment_start; s < match; s++) tex_putc(*s, stdout); /* Print partial match. */ for (; sp > 0; sp--) putc(' ', stdout); /* Print buffered spaces. */ c = put_code_line(c); fputs(end_code_line, stdout); } if (c == EOF) break; putc(c, stdout); /* print newline. */ } if (just_saw_code) fputs(end_code, stdout); return 0; } /*\subsection{Match string} \verb-match_string- matches input to a pattern. When done, characters in the pattern string with address less than \verb-*match- have been matched with the input. If \verb-*match- points to the end of string character, a complete match was found. \verb-match_string- returns the character after the last one that matched. */ int match_string (pattern, match) char *pattern; char **match; { int c; for (;; pattern++) { c = getchar_xtab(); if (*pattern != c || *pattern == '\0') { *match = pattern; return c; } } } /*\subsection{Put comment}*/ int put_comment(c) int c; { char *match, *s; while (1) { if (c == *comment_end) { c = match_string(comment_end+1, &match); if (*match == '\0') return c; /* Comment end found. */ for (s = comment_end; s < match; s++) putc(*s, stdout); /* Print partial match. */ } if (c == EOF) return fatal ("EOF within a comment."); putc(c, stdout); c = getchar_xtab(); } } /*\subsection{Put quoted}*/ int put_quoted (q, m) int q; /* Quote character. */ char *m; /* EOF message. */ { int c; tex_putc(q, stdout); while (1) { c = getchar_xtab(); if (c == EOF) return fatal (m); else if (c == q) { tex_putc(c, stdout); return getchar_xtab(); } else if (c == '\\') { /* Backslash quotes within */ tex_putc(c, stdout); /* quoted text. */ c = getchar_xtab(); if (c == EOF) return fatal (m); tex_putc(c, stdout); } else tex_putc(c, stdout); } } /*\subsection{Put code line}*/ int put_code_line (c) int c; { char *match, *s; while (1) switch (c) { case EOF: return c; case '\n': return c; case '"': c = put_quoted (c, "EOF within a string"); break; case '\'': c = put_quoted (c, "EOF within a character"); break; default: if (c == *comment_start) { c = match_string(comment_start+1, &match); if (*match == '\0') { /* Found comment */ tex_puts(comment_start, stdout); fputs(begin_comment, stdout); c = put_comment(c); fputs(end_comment, stdout); tex_puts(comment_end, stdout); } else /* Print partial match. */ for (s = comment_start; s < match; s++) tex_putc(*s, stdout); } else { /* Just print the character. */ tex_putc(c, stdout); c = getchar_xtab(); } } } /*\subsection{Fatal}*/ int lineno = 1; /* Input source line number. */ int fatal(message) /* Report fatal errors and exit. */ char *message; { void exit(); fprintf(stderr, "Fatal error on line %d: %s\n", lineno, message); exit (1); return 0; /* Return keeps lint happy. */ } /*\subsection{Getchar xtab}*/ /* All input is processed by \verb-getchar_xtab- so that TAB characters can be expanded. \TeX{} treats TAB characters as a space---not what is wanted. */ int getchar_xtab() { int c; static int spaces = 0; /* Spaces left to print a TAB. */ static int column = 0; /* Current input column. */ if (spaces > 0) { spaces--; return ' '; } switch (c = getc(stdin)) { case '\t': spaces = 7 - (7&column); column += spaces + 1; return ' '; case '\n': lineno++; /* for {\tt fatal} */ column = 0; return c; default: column++; return c; } } /*\subsection{\TeX{} putc} \verb-tex_putc- handles the case in which you want to print the character that is used to bound the \verb-\verb- text. */ void tex_putc (c, f) int c; FILE *f; { if (c == '%') fputs("%\\verb-%-\\verb%", f); else putc (c, f); } /*\subsection{\TeX{} puts} \verb-tex_putc-'s the elements of a string.*/ void tex_puts(s, f) char *s; FILE *f; { while (*s != '\0') tex_putc(*s++, f); } /*\subsection{Main}*/ int main (argc, argv) int argc; char *argv[]; { switch (argc) { case 3: case 2: if (NULL == freopen(argv[1], "r", stdin)) { fprintf(stderr, "Cannot open %s for reading.\n", argv[1]); break; } if (argc == 3 && NULL == freopen(argv[2], "w", stdout)) { fprintf(stderr, "Cannot open %s for writing.\n", argv[2]); break; } case 1: return filter(); } fprintf(stderr, "Usage: %s [C file] [LaTeX file]\n", argv[0]); return 1; } /*\fi*/ /*\end{document}*/ /* MITRE Corporation General Public License Version 1, October 1990 Copyright (C) 1990 The MITRE Corporation Burlington Road, Bedford, MA. 01730 Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. Preamble This General Public License is intended to guarantee freedom to share and change software--to make sure the software is free for all its users. The General Public License applies to the MITRE Corporation's software. When we speak of free software, we are referring to freedom, not price. Specifically, the General Public License is designed to make sure that you have the freedom to give away copies of free software, that you receive source code or can get it if you want it, that you can change the software or use pieces of it in new free programs; and that you know you can do these things. To protect your rights, we need to make restrictions that forbid anyone to deny you these rights or to ask you to surrender the rights. These restrictions translate to certain responsibilities for you if you distribute copies of the software, or if you modify it. For example, if you distribute copies of a such a program, whether gratis or for a distribution fee, you must give the recipients all the rights that you have. You must make sure that they, too, receive or can get the source code. And you must tell them their rights. We protect your rights with two steps: (1) copyright the software, and (2) offer you this license which gives you legal permission to copy, distribute and/or modify the software. Also, for each author's protection and ours, we want to make certain that everyone understands that there is no warranty for this free software. If the software is modified by someone else and passed on, we want its recipients to know that what they have is not the original, so that any problems introduced by others will not reflect on the original authors' reputations. The precise terms and conditions for copying, distribution and modification follow. MITRE Corporation GENERAL PUBLIC LICENSE TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 0. This License Agreement applies to any program or other work which contains a notice placed by the copyright holder saying it may be distributed under the terms of this General Public License. The "Program", below, refers to any such program or work, and a "work based on the Program" means either the Program or any work containing the Program or a portion of it, either verbatim or with modifications. Each licensee is addressed as "you". 1. 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