fmt.c revision 95258
177807Sru/* $OpenBSD: fmt.c,v 1.16 2000/06/25 15:35:42 pjanzen Exp $ */ 277807Sru 377807Sru/* Sensible version of fmt 41590Srgrimes * 577807Sru * Syntax: fmt [ options ] [ goal [ max ] ] [ filename ... ] 677807Sru * 777807Sru * Since the documentation for the original fmt is so poor, here 877807Sru * is an accurate description of what this one does. It's usually 977807Sru * the same. The *mechanism* used may differ from that suggested 1077807Sru * here. Note that we are *not* entirely compatible with fmt, 1177807Sru * because fmt gets so many things wrong. 1277807Sru * 1377807Sru * 1. Tabs are expanded, assuming 8-space tab stops. 1477807Sru * If the `-t <n>' option is given, we assume <n>-space 1577807Sru * tab stops instead. 1677807Sru * Trailing blanks are removed from all lines. 1777807Sru * x\b == nothing, for any x other than \b. 1877807Sru * Other control characters are simply stripped. This 1977807Sru * includes \r. 2077807Sru * 2. Each line is split into leading whitespace and 2177807Sru * everything else. Maximal consecutive sequences of 2277807Sru * lines with the same leading whitespace are considered 2377807Sru * to form paragraphs, except that a blank line is always 2477807Sru * a paragraph to itself. 2577807Sru * If the `-p' option is given then the first line of a 2677807Sru * paragraph is permitted to have indentation different 2777807Sru * from that of the other lines. 2877807Sru * If the `-m' option is given then a line that looks 2977807Sru * like a mail message header, if it is not immediately 3077807Sru * preceded by a non-blank non-message-header line, is 3177807Sru * taken to start a new paragraph, which also contains 3277807Sru * any subsequent lines with non-empty leading whitespace. 3389268Sru * Unless the `-n' option is given, lines beginning with 3489268Sru * a . (dot) are not formatted. 3577807Sru * 3. The "everything else" is split into words; a word 3677807Sru * includes its trailing whitespace, and a word at the 3777807Sru * end of a line is deemed to be followed by a single 3877807Sru * space, or two spaces if it ends with a sentence-end 3977807Sru * character. (See the `-d' option for how to change that.) 4077807Sru * If the `-s' option has been given, then a word's trailing 4177807Sru * whitespace is replaced by what it would have had if it 4277807Sru * had occurred at end of line. 4377807Sru * 4. Each paragraph is sent to standard output as follows. 4477807Sru * We output the leading whitespace, and then enough words 4577807Sru * to make the line length as near as possible to the goal 4677807Sru * without exceeding the maximum. (If a single word would 4777807Sru * exceed the maximum, we output that anyway.) Of course 4877807Sru * the trailing whitespace of the last word is ignored. 4977807Sru * We then emit a newline and start again if there are any 5077807Sru * words left. 5177807Sru * Note that for a blank line this translates as "We emit 5277807Sru * a newline". 5377807Sru * If the `-l <n>' option is given, then leading whitespace 5477807Sru * is modified slightly: <n> spaces are replaced by a tab. 5577807Sru * Indented paragraphs (see above under `-p') make matters 5677807Sru * more complicated than this suggests. Actually every paragraph 5777807Sru * has two `leading whitespace' values; the value for the first 5877807Sru * line, and the value for the most recent line. (While processing 5977807Sru * the first line, the two are equal. When `-p' has not been 6077807Sru * given, they are always equal.) The leading whitespace 6177807Sru * actually output is that of the first line (for the first 6277807Sru * line of *output*) or that of the most recent line (for 6377807Sru * all other lines of output). 6477807Sru * When `-m' has been given, message header paragraphs are 6577807Sru * taken as having first-leading-whitespace empty and 6677807Sru * subsequent-leading-whitespace two spaces. 6777807Sru * 6877807Sru * Multiple input files are formatted one at a time, so that a file 6977807Sru * never ends in the middle of a line. 7077807Sru * 7177807Sru * There's an alternative mode of operation, invoked by giving 7277807Sru * the `-c' option. In that case we just center every line, 7377807Sru * and most of the other options are ignored. This should 7477807Sru * really be in a separate program, but we must stay compatible 7577807Sru * with old `fmt'. 7677807Sru * 7777807Sru * QUERY: Should `-m' also try to do the right thing with quoted text? 7877807Sru * QUERY: `-b' to treat backslashed whitespace as old `fmt' does? 7977807Sru * QUERY: Option meaning `never join lines'? 8077807Sru * QUERY: Option meaning `split in mid-word to avoid overlong lines'? 8177807Sru * (Those last two might not be useful, since we have `fold'.) 8277807Sru * 8377807Sru * Differences from old `fmt': 8477807Sru * 8577807Sru * - We have many more options. Options that aren't understood 8677807Sru * generate a lengthy usage message, rather than being 8777807Sru * treated as filenames. 8877807Sru * - Even with `-m', our handling of message headers is 8977807Sru * significantly different. (And much better.) 9077807Sru * - We don't treat `\ ' as non-word-breaking. 9177807Sru * - Downward changes of indentation start new paragraphs 9277807Sru * for us, as well as upward. (I think old `fmt' behaves 9377807Sru * in the way it does in order to allow indented paragraphs, 9477807Sru * but this is a broken way of making indented paragraphs 9577807Sru * behave right.) 9677807Sru * - Given the choice of going over or under |goal_length| 9777807Sru * by the same amount, we go over; old `fmt' goes under. 9877807Sru * - We treat `?' as ending a sentence, and not `:'. Old `fmt' 9977807Sru * does the reverse. 10077807Sru * - We return approved return codes. Old `fmt' returns 10177807Sru * 1 for some errors, and *the number of unopenable files* 10277807Sru * when that was all that went wrong. 10377807Sru * - We have fewer crashes and more helpful error messages. 10477807Sru * - We don't turn spaces into tabs at starts of lines unless 10577807Sru * specifically requested. 10677807Sru * - New `fmt' is somewhat smaller and slightly faster than 10777807Sru * old `fmt'. 10877807Sru * 10977807Sru * Bugs: 11077807Sru * 11177807Sru * None known. There probably are some, though. 11277807Sru * 11377807Sru * Portability: 11477807Sru * 11577807Sru * I believe this code to be pretty portable. It does require 11677807Sru * that you have `getopt'. If you need to include "getopt.h" 11777807Sru * for this (e.g., if your system didn't come with `getopt' 11877807Sru * and you installed it yourself) then you should arrange for 11977807Sru * NEED_getopt_h to be #defined. 12077807Sru * 12177807Sru * Everything here should work OK even on nasty 16-bit 12277807Sru * machines and nice 64-bit ones. However, it's only really 12377807Sru * been tested on my FreeBSD machine. Your mileage may vary. 12477807Sru */ 12577807Sru 12677807Sru/* Copyright (c) 1997 Gareth McCaughan. All rights reserved. 12777807Sru * 12877807Sru * Redistribution and use of this code, in source or binary forms, 12977807Sru * with or without modification, are permitted subject to the following 13077807Sru * conditions: 13177807Sru * 13277807Sru * - Redistribution of source code must retain the above copyright 1331590Srgrimes * notice, this list of conditions and the following disclaimer. 1341590Srgrimes * 13577807Sru * - If you distribute modified source code it must also include 13677807Sru * a notice saying that it has been modified, and giving a brief 13777807Sru * description of what changes have been made. 13877807Sru * 13977807Sru * Disclaimer: I am not responsible for the results of using this code. 14077807Sru * If it formats your hard disc, sends obscene messages to 14177807Sru * your boss and kills your children then that's your problem 14277807Sru * not mine. I give absolutely no warranty of any sort as to 14377807Sru * what the program will do, and absolutely refuse to be held 14477807Sru * liable for any consequences of your using it. 14577807Sru * Thank you. Have a nice day. 1461590Srgrimes */ 1471590Srgrimes 14877807Sru/* RCS change log: 14977807Sru * Revision 1.5 1998/03/02 18:02:21 gjm11 15077807Sru * Minor changes for portability. 15177807Sru * 15277807Sru * Revision 1.4 1997/10/01 11:51:28 gjm11 15377807Sru * Repair broken indented-paragraph handling. 15477807Sru * Add mail message header stuff. 15577807Sru * Improve comments and layout. 15677807Sru * Make usable with non-BSD systems. 15777807Sru * Add revision display to usage message. 15877807Sru * 15977807Sru * Revision 1.3 1997/09/30 16:24:47 gjm11 16077807Sru * Add copyright notice, rcsid string and log message. 16177807Sru * 16277807Sru * Revision 1.2 1997/09/30 16:13:39 gjm11 16377807Sru * Add options: -d <chars>, -l <width>, -p, -s, -t <width>, -h . 16477807Sru * Parse options with `getopt'. Clean up code generally. 16577807Sru * Make comments more accurate. 16677807Sru * 16777807Sru * Revision 1.1 1997/09/30 11:29:57 gjm11 16877807Sru * Initial revision 16977807Sru */ 1701590Srgrimes 1711590Srgrimes#ifndef lint 17227185Scharnierstatic const char rcsid[] = 17350477Speter "$FreeBSD: head/usr.bin/fmt/fmt.c 95258 2002-04-22 13:44:47Z des $"; 17477807Srustatic const char copyright[] = 17577807Sru "Copyright (c) 1997 Gareth McCaughan. All rights reserved.\n"; 1761590Srgrimes#endif /* not lint */ 1771590Srgrimes 1781590Srgrimes#include <ctype.h> 17927185Scharnier#include <err.h> 18011765Sache#include <locale.h> 18127185Scharnier#include <stdio.h> 18212317Sjoerg#include <stdlib.h> 18327185Scharnier#include <string.h> 18477807Sru#include <sysexits.h> 18577807Sru#include <unistd.h> 1861590Srgrimes 18777807Sru/* Something that, we hope, will never be a genuine line length, 18877807Sru * indentation etc. 1891590Srgrimes */ 19077807Sru#define SILLY ((size_t)-1) 1911590Srgrimes 19277807Sru/* I used to use |strtoul| for this, but (1) not all systems have it 19377807Sru * and (2) it's probably better to use |strtol| to detect negative 19477807Sru * numbers better. 19577807Sru * If |fussyp==0| then we don't complain about non-numbers 19677807Sru * (returning 0 instead), but we do complain about bad numbers. 1971590Srgrimes */ 19877807Srustatic size_t 19977807Sruget_positive(const char *s, const char *err_mess, int fussyP) { 20077807Sru char *t; 20177807Sru long result = strtol(s,&t,0); 20277807Sru if (*t) { if (fussyP) goto Lose; else return 0; } 20381510Skris if (result<=0) { Lose: errx(EX_USAGE, "%s", err_mess); } 20477807Sru return (size_t) result; 20577807Sru} 2061590Srgrimes 20781701Srustatic size_t 20881701Sruget_nonnegative(const char *s, const char *err_mess, int fussyP) { 20981701Sru char *t; 21081701Sru long result = strtol(s,&t,0); 21181701Sru if (*t) { if (fussyP) goto Lose; else return 0; } 21281701Sru if (result<0) { Lose: errx(EX_USAGE, "%s", err_mess); } 21381701Sru return (size_t) result; 21481701Sru} 21581701Sru 21677807Sru/* Global variables */ 2171590Srgrimes 21877807Srustatic int centerP=0; /* Try to center lines? */ 21977807Srustatic size_t goal_length=0; /* Target length for output lines */ 22077807Srustatic size_t max_length=0; /* Maximum length for output lines */ 22177807Srustatic int coalesce_spaces_P=0; /* Coalesce multiple whitespace -> ' ' ? */ 22277807Srustatic int allow_indented_paragraphs=0; /* Can first line have diff. ind.? */ 22377807Srustatic int tab_width=8; /* Number of spaces per tab stop */ 22481701Srustatic size_t output_tab_width=8; /* Ditto, when squashing leading spaces */ 22577807Srustatic const char *sentence_enders=".?!"; /* Double-space after these */ 22677807Srustatic int grok_mail_headers=0; /* treat embedded mail headers magically? */ 22789268Srustatic int format_troff=0; /* Format troff? */ 2281590Srgrimes 22977807Srustatic int n_errors=0; /* Number of failed files. Return on exit. */ 23077807Srustatic char *output_buffer=0; /* Output line will be built here */ 23177807Srustatic size_t x; /* Horizontal position in output line */ 23277807Srustatic size_t x0; /* Ditto, ignoring leading whitespace */ 23377807Srustatic size_t pending_spaces; /* Spaces to add before next word */ 23477807Srustatic int output_in_paragraph=0; /* Any of current para written out yet? */ 23527185Scharnier 23677807Sru/* Prototypes */ 23777807Sru 23877807Srustatic void process_named_file (const char *); 23977807Srustatic void process_stream (FILE *, const char *); 24077807Srustatic size_t indent_length (const char *, size_t); 24177807Srustatic int might_be_header (const unsigned char *); 24277807Srustatic void new_paragraph (size_t, size_t); 24377807Srustatic void output_word (size_t, size_t, const char *, size_t, size_t); 24477807Srustatic void output_indent (size_t); 24577807Srustatic void center_stream (FILE *, const char *); 24677807Srustatic char * get_line (FILE *, size_t *); 24777807Srustatic void * xrealloc (void *, size_t); 24877807Sru 24977807Sru#define XMALLOC(x) xrealloc(0,x) 25077807Sru 25177807Sru/* Here is perhaps the right place to mention that this code is 25277807Sru * all in top-down order. Hence, |main| comes first. 2531590Srgrimes */ 25427185Scharnierint 25577807Srumain(int argc, char *argv[]) { 25677807Sru int ch; /* used for |getopt| processing */ 2571590Srgrimes 25811765Sache 25977807Sru (void) setlocale(LC_CTYPE, ""); 2601590Srgrimes 26177807Sru /* 1. Grok parameters. */ 2621590Srgrimes 26389268Sru while ((ch = getopt(argc, argv, "0123456789cd:hl:mnpst:w:")) != -1) 26477807Sru switch(ch) { 26577807Sru case 'c': 26677807Sru centerP = 1; 26789268Sru format_troff = 1; 26877807Sru continue; 26977807Sru case 'd': 27077807Sru sentence_enders = optarg; 27177807Sru continue; 27277807Sru case 'l': 27377807Sru output_tab_width 27481701Sru = get_nonnegative(optarg, "output tab width must be non-negative", 1); 27577807Sru continue; 27677807Sru case 'm': 27777807Sru grok_mail_headers = 1; 27877807Sru continue; 27989268Sru case 'n': 28089268Sru format_troff = 1; 28189268Sru continue; 28277807Sru case 'p': 28377807Sru allow_indented_paragraphs = 1; 28477807Sru continue; 28577807Sru case 's': 28677807Sru coalesce_spaces_P = 1; 28777807Sru continue; 28877807Sru case 't': 28977807Sru tab_width = get_positive(optarg, "tab width must be positive", 1); 29077807Sru continue; 29177807Sru case 'w': 29277807Sru goal_length = get_positive(optarg, "width must be positive", 1); 29377807Sru max_length = goal_length; 29477807Sru continue; 29577807Sru case '0': case '1': case '2': case '3': case '4': case '5': 29677807Sru case '6': case '7': case '8': case '9': 29777807Sru /* XXX this is not a stylistically approved use of getopt() */ 29877807Sru if (goal_length==0) { 29977807Sru char *p; 30077807Sru p = argv[optind - 1]; 30177807Sru if (p[0] == '-' && p[1] == ch && !p[2]) 30277807Sru goal_length = get_positive(++p, "width must be nonzero", 1); 30377807Sru else 30477807Sru goal_length = get_positive(argv[optind]+1, 30577807Sru "width must be nonzero", 1); 30677807Sru max_length = goal_length; 30777807Sru } 30877807Sru continue; 30977807Sru case 'h': default: 31077807Sru fprintf(stderr, 31195258Sdes"usage: fmt [-cmps] [-d chars] [-l num] [-t num]\n" 31277807Sru" [-w width | -width | goal [maximum]] [file ...]\n" 31377807Sru"Options: -c center each line instead of formatting\n" 31477807Sru" -d <chars> double-space after <chars> at line end\n" 31577807Sru" -l <n> turn each <n> spaces at start of line into a tab\n" 31677807Sru" -m try to make sure mail header lines stay separate\n" 31789268Sru" -n format lines beginning with a dot\n" 31877807Sru" -p allow indented paragraphs\n" 31977807Sru" -s coalesce whitespace inside lines\n" 32077807Sru" -t <n> have tabs every <n> columns\n" 32177807Sru" -w <n> set maximum width to <n>\n" 32277807Sru" goal set target width to goal\n"); 32377807Sru exit(ch=='h' ? 0 : EX_USAGE); 32477807Sru } 32577807Sru argc -= optind; argv += optind; 32628478Sjlemon 32777807Sru /* [ goal [ maximum ] ] */ 3281590Srgrimes 32977807Sru if (argc>0 && goal_length==0 33077807Sru && (goal_length=get_positive(*argv,"goal length must be positive", 0)) 33177807Sru != 0) { 33277807Sru --argc; ++argv; 33377807Sru if (argc>0 33477807Sru && (max_length=get_positive(*argv,"max length must be positive", 0)) 33577807Sru != 0) { 33677807Sru --argc; ++argv; 33777807Sru if (max_length<goal_length) 33877807Sru errx(EX_USAGE, "max length must be >= goal length"); 33977807Sru } 34077807Sru } 34177807Sru if (goal_length==0) goal_length = 65; 34277807Sru if (max_length==0) max_length = goal_length+10; 34377807Sru output_buffer = XMALLOC(max_length+1); /* really needn't be longer */ 3448874Srgrimes 34577807Sru /* 2. Process files. */ 34615344Ssmpatel 34777807Sru if (argc>0) { 34877807Sru while (argc-->0) process_named_file(*argv++); 34977807Sru } 35077807Sru else { 35177807Sru process_stream(stdin, "standard input"); 35277807Sru } 3531590Srgrimes 35477807Sru /* We're done. */ 35577807Sru 35677807Sru return n_errors ? EX_NOINPUT : 0; 35777807Sru 3581590Srgrimes} 3591590Srgrimes 36077807Sru/* Process a single file, given its name. 3611590Srgrimes */ 36277807Srustatic void 36377807Sruprocess_named_file(const char *name) { 36477807Sru FILE *f=fopen(name, "r"); 36577807Sru if (!f) { perror(name); ++n_errors; } 36677807Sru else { 36777807Sru process_stream(f, name); 36877807Sru fclose(f); 36977807Sru } 3701590Srgrimes} 3711590Srgrimes 37277807Sru/* Types of mail header continuation lines: 3731590Srgrimes */ 37477807Srutypedef enum { 37577807Sru hdr_ParagraphStart = -1, 37677807Sru hdr_NonHeader = 0, 37777807Sru hdr_Header = 1, 37877807Sru hdr_Continuation = 2 37977807Sru} HdrType; 3801590Srgrimes 38177807Sru/* Process a stream. This is where the real work happens, 38277807Sru * except that centering is handled separately. 38377807Sru */ 38477807Srustatic void 38577807Sruprocess_stream(FILE *stream, const char *name) { 38677807Sru size_t last_indent=SILLY; /* how many spaces in last indent? */ 38777807Sru size_t para_line_number=0; /* how many lines already read in this para? */ 38877807Sru size_t first_indent=SILLY; /* indentation of line 0 of paragraph */ 38977807Sru HdrType prev_header_type=hdr_ParagraphStart; 39077807Sru /* ^-- header_type of previous line; -1 at para start */ 39177807Sru char *line; 39277807Sru size_t length; 39330009Sjoerg 39477807Sru if (centerP) { center_stream(stream, name); return; } 39577807Sru while ((line=get_line(stream,&length)) != NULL) { 39677807Sru size_t np=indent_length(line, length); 39777807Sru { HdrType header_type=hdr_NonHeader; 39877807Sru if (grok_mail_headers && prev_header_type!=hdr_NonHeader) { 39977807Sru if (np==0 && might_be_header(line)) 40077807Sru header_type = hdr_Header; 40177807Sru else if (np>0 && prev_header_type>hdr_NonHeader) 40277807Sru header_type = hdr_Continuation; 40377807Sru } 40477807Sru /* We need a new paragraph if and only if: 40577807Sru * this line is blank, 40689268Sru * OR it's a troff request (and we don't format troff), 40777807Sru * OR it's a mail header, 40877807Sru * OR it's not a mail header AND the last line was one, 40977807Sru * OR the indentation has changed 41077807Sru * AND the line isn't a mail header continuation line 41177807Sru * AND this isn't the second line of an indented paragraph. 41277807Sru */ 41377807Sru if ( length==0 41489268Sru || (line[0]=='.' && !format_troff) 41577807Sru || header_type==hdr_Header 41677807Sru || (header_type==hdr_NonHeader && prev_header_type>hdr_NonHeader) 41777807Sru || (np!=last_indent 41877807Sru && header_type != hdr_Continuation 41977807Sru && (!allow_indented_paragraphs || para_line_number != 1)) ) { 42077807Sru new_paragraph(output_in_paragraph ? last_indent : first_indent, np); 42177807Sru para_line_number = 0; 42277807Sru first_indent = np; 42377807Sru last_indent = np; 42477807Sru if (header_type==hdr_Header) last_indent=2; /* for cont. lines */ 42589268Sru if (length==0 || (line[0]=='.' && !format_troff)) { 42689268Sru if (length==0) 42789268Sru putchar('\n'); 42889268Sru else 42989268Sru printf("%.*s\n", (int)length, line); 43077807Sru prev_header_type=hdr_ParagraphStart; 43177807Sru continue; 43277807Sru } 43377807Sru } 43477807Sru else { 43577807Sru /* If this is an indented paragraph other than a mail header 43677807Sru * continuation, set |last_indent|. 43777807Sru */ 43877807Sru if (np != last_indent && header_type != hdr_Continuation) 43977807Sru last_indent=np; 44077807Sru } 44177807Sru prev_header_type = header_type; 44277807Sru } 4431590Srgrimes 44477807Sru { size_t n=np; 44577807Sru while (n<length) { 44677807Sru /* Find word end and count spaces after it */ 44777807Sru size_t word_length=0, space_length=0; 44877807Sru while (n+word_length < length && line[n+word_length] != ' ') 44977807Sru ++word_length; 45077807Sru space_length = word_length; 45177807Sru while (n+space_length < length && line[n+space_length] == ' ') 45277807Sru ++space_length; 45377807Sru /* Send the word to the output machinery. */ 45477807Sru output_word(first_indent, last_indent, 45577807Sru line+n, word_length, space_length-word_length); 45677807Sru n += space_length; 45777807Sru } 45877807Sru } 45977807Sru ++para_line_number; 46077807Sru } 46177807Sru new_paragraph(output_in_paragraph ? last_indent : first_indent, 0); 46277807Sru if (ferror(stream)) { perror(name); ++n_errors; } 4631590Srgrimes} 4641590Srgrimes 46577807Sru/* How long is the indent on this line? 4661590Srgrimes */ 46777807Srustatic size_t 46877807Sruindent_length(const char *line, size_t length) { 46977807Sru size_t n=0; 47077807Sru while (n<length && *line++ == ' ') ++n; 47177807Sru return n; 47277807Sru} 4731590Srgrimes 47477807Sru/* Might this line be a mail header? 47577807Sru * We deem a line to be a possible header if it matches the 47677807Sru * Perl regexp /^[A-Z][-A-Za-z0-9]*:\s/. This is *not* the same 47777807Sru * as in RFC whatever-number-it-is; we want to be gratuitously 47877807Sru * conservative to avoid mangling ordinary civilised text. 4791590Srgrimes */ 48077807Srustatic int 48177807Srumight_be_header(const unsigned char *line) { 48277807Sru if (!isupper(*line++)) return 0; 48377807Sru while (*line && (isalnum(*line) || *line=='-')) ++line; 48477807Sru return (*line==':' && isspace(line[1])); 4851590Srgrimes} 4861590Srgrimes 48777807Sru/* Begin a new paragraph with an indent of |indent| spaces. 4881590Srgrimes */ 48977807Srustatic void 49077807Srunew_paragraph(size_t old_indent, size_t indent) { 49177807Sru if (x0) { 49277807Sru if (old_indent>0) output_indent(old_indent); 49377807Sru fwrite(output_buffer, 1, x0, stdout); 49477807Sru putchar('\n'); 49577807Sru } 49677807Sru x=indent; x0=0; pending_spaces=0; 49777807Sru output_in_paragraph = 0; 4981590Srgrimes} 4991590Srgrimes 50077807Sru/* Output spaces or tabs for leading indentation. 5011590Srgrimes */ 50277807Srustatic void 50377807Sruoutput_indent(size_t n_spaces) { 50477807Sru if (output_tab_width) { 50577807Sru while (n_spaces >= output_tab_width) { 50677807Sru putchar('\t'); 50777807Sru n_spaces -= output_tab_width; 50877807Sru } 50977807Sru } 51077807Sru while (n_spaces-- > 0) putchar(' '); 5111590Srgrimes} 5121590Srgrimes 51377807Sru/* Output a single word, or add it to the buffer. 51477807Sru * indent0 and indent1 are the indents to use on the first and subsequent 51577807Sru * lines of a paragraph. They'll often be the same, of course. 5161590Srgrimes */ 51777807Srustatic void 51877807Sruoutput_word(size_t indent0, size_t indent1, const char *word, size_t length, size_t spaces) { 51977807Sru size_t new_x = x+pending_spaces+length; 52077807Sru size_t indent = output_in_paragraph ? indent1 : indent0; 5211590Srgrimes 52277807Sru /* If either |spaces==0| (at end of line) or |coalesce_spaces_P| 52377807Sru * (squashing internal whitespace), then add just one space; 52477807Sru * except that if the last character was a sentence-ender we 52577807Sru * actually add two spaces. 52677807Sru */ 52777807Sru if (coalesce_spaces_P || spaces==0) 52877807Sru spaces = strchr(sentence_enders, word[length-1]) ? 2 : 1; 5298874Srgrimes 53077807Sru if (new_x<=goal_length) { 53177807Sru /* After adding the word we still aren't at the goal length, 53277807Sru * so clearly we add it to the buffer rather than outputing it. 53377807Sru */ 53477807Sru memset(output_buffer+x0, ' ', pending_spaces); 53577807Sru x0 += pending_spaces; x += pending_spaces; 53677807Sru memcpy(output_buffer+x0, word, length); 53777807Sru x0 += length; x += length; 53877807Sru pending_spaces = spaces; 53977807Sru } 54077807Sru else { 54177807Sru /* Adding the word takes us past the goal. Print the line-so-far, 54277807Sru * and the word too iff either (1) the lsf is empty or (2) that 54377807Sru * makes us nearer the goal but doesn't take us over the limit, 54477807Sru * or (3) the word on its own takes us over the limit. 54577807Sru * In case (3) we put a newline in between. 54677807Sru */ 54777807Sru if (indent>0) output_indent(indent); 54877807Sru fwrite(output_buffer, 1, x0, stdout); 54977807Sru if (x0==0 || (new_x <= max_length && new_x-goal_length <= goal_length-x)) { 55078334Sjlemon printf("%*s", (int)pending_spaces, ""); 55177807Sru goto write_out_word; 55277807Sru } 55377807Sru else { 55477807Sru /* If the word takes us over the limit on its own, just 55577807Sru * spit it out and don't bother buffering it. 55677807Sru */ 55777807Sru if (indent+length > max_length) { 55877807Sru putchar('\n'); 55977807Sru if (indent>0) output_indent(indent); 56077807Sruwrite_out_word: 56177807Sru fwrite(word, 1, length, stdout); 56277807Sru x0 = 0; x = indent1; pending_spaces = 0; 56377807Sru } 56477807Sru else { 56577807Sru memcpy(output_buffer, word, length); 56677807Sru x0 = length; x = length+indent1; pending_spaces = spaces; 56777807Sru } 56877807Sru } 56977807Sru putchar('\n'); 57077807Sru output_in_paragraph = 1; 57177807Sru } 5721590Srgrimes} 5731590Srgrimes 57477807Sru/* Process a stream, but just center its lines rather than trying to 57577807Sru * format them neatly. 5761590Srgrimes */ 57777807Srustatic void 57877807Srucenter_stream(FILE *stream, const char *name) { 57977807Sru char *line; 58077807Sru size_t length; 58177807Sru while ((line=get_line(stream, &length)) != 0) { 58277807Sru size_t l=length; 58377807Sru while (l>0 && isspace(*line)) { ++line; --l; } 58477807Sru length=l; 58577807Sru while (l<goal_length) { putchar(' '); l+=2; } 58677807Sru fwrite(line, 1, length, stdout); 58777807Sru putchar('\n'); 58877807Sru } 58977807Sru if (ferror(stream)) { perror(name); ++n_errors; } 5901590Srgrimes} 5911590Srgrimes 59277807Sru/* Get a single line from a stream. Expand tabs, strip control 59377807Sru * characters and trailing whitespace, and handle backspaces. 59477807Sru * Return the address of the buffer containing the line, and 59577807Sru * put the length of the line in |lengthp|. 59677807Sru * This can cope with arbitrarily long lines, and with lines 59777807Sru * without terminating \n. 59877807Sru * If there are no characters left or an error happens, we 59977807Sru * return 0. 60077807Sru * Don't confuse |spaces_pending| here with the global 60177807Sru * |pending_spaces|. 6021590Srgrimes */ 60377807Srustatic char * 60477807Sruget_line(FILE *stream, size_t *lengthp) { 60577807Sru static char *buf=NULL; 60677807Sru static size_t length=0; 60777807Sru size_t len=0; 60877807Sru int ch; 60977807Sru size_t spaces_pending=0; 61089268Sru int troff=0; 6111590Srgrimes 61277807Sru if (buf==NULL) { length=100; buf=XMALLOC(length); } 61377807Sru while ((ch=getc(stream)) != '\n' && ch != EOF) { 61489268Sru if (len+spaces_pending==0 && ch=='.' && !format_troff) troff=1; 61577807Sru if (ch==' ') ++spaces_pending; 61689268Sru else if (troff || isprint(ch)) { 61777807Sru while (len+spaces_pending >= length) { 61877807Sru length*=2; buf=xrealloc(buf, length); 61977807Sru } 62077807Sru while (spaces_pending > 0) { --spaces_pending; buf[len++]=' '; } 62177807Sru buf[len++] = ch; 62277807Sru } 62377807Sru else if (ch=='\t') 62477807Sru spaces_pending += tab_width - (len+spaces_pending)%tab_width; 62577807Sru else if (ch=='\b') { if (len) --len; } 62677807Sru } 62777807Sru *lengthp=len; 62877807Sru return (len>0 || ch!=EOF) ? buf : 0; 6291590Srgrimes} 6301590Srgrimes 63177807Sru/* (Re)allocate some memory, exiting with an error if we can't. 6321590Srgrimes */ 63377807Srustatic void * 63477807Sruxrealloc(void *ptr, size_t nbytes) { 63577807Sru void *p = realloc(ptr, nbytes); 63677807Sru if (p == NULL) errx(EX_OSERR, "out of memory"); 63777807Sru return p; 6381590Srgrimes} 639