compile.c revision 171206
1164640Sflz/*- 298186Sgordon * Copyright (c) 1992 Diomidis Spinellis. 378344Sobrien * Copyright (c) 1992, 1993 4157473Sflz * The Regents of the University of California. All rights reserved. 578344Sobrien * 678344Sobrien * This code is derived from software contributed to Berkeley by 778344Sobrien * Diomidis Spinellis of Imperial College, University of London. 878344Sobrien * 978344Sobrien * Redistribution and use in source and binary forms, with or without 1078344Sobrien * modification, are permitted provided that the following conditions 1178344Sobrien * are met: 1278344Sobrien * 1. Redistributions of source code must retain the above copyright 1378344Sobrien * notice, this list of conditions and the following disclaimer. 1478344Sobrien * 2. Redistributions in binary form must reproduce the above copyright 1578344Sobrien * notice, this list of conditions and the following disclaimer in the 1678344Sobrien * documentation and/or other materials provided with the distribution. 1778344Sobrien * 4. Neither the name of the University nor the names of its contributors 1878344Sobrien * may be used to endorse or promote products derived from this software 1978344Sobrien * without specific prior written permission. 2078344Sobrien * 2178344Sobrien * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2278344Sobrien * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2378344Sobrien * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2478344Sobrien * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2578344Sobrien * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2678344Sobrien * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2778344Sobrien * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2878344Sobrien * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2978344Sobrien * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3078344Sobrien * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3178344Sobrien * SUCH DAMAGE. 3278344Sobrien */ 3378344Sobrien 3478344Sobrien#include <sys/cdefs.h> 35157473Sflz__FBSDID("$FreeBSD: head/usr.bin/sed/compile.c 171206 2007-07-04 16:42:41Z ssouhlal $"); 36169668Smtm 37157473Sflz#ifndef lint 3878344Sobrienstatic const char sccsid[] = "@(#)compile.c 8.1 (Berkeley) 6/6/93"; 3998186Sgordon#endif 4098186Sgordon 4198186Sgordon#include <sys/types.h> 42131550Scperciva#include <sys/stat.h> 43131550Scperciva 44131550Scperciva#include <ctype.h> 45131550Scperciva#include <err.h> 4698186Sgordon#include <errno.h> 4798186Sgordon#include <fcntl.h> 48202988Semaste#include <limits.h> 49124832Smtm#include <regex.h> 50124832Smtm#include <stdio.h> 51161435Syar#include <stdlib.h> 52161435Syar#include <string.h> 5398186Sgordon#include <wchar.h> 5498186Sgordon 5578344Sobrien#include "defs.h" 5678344Sobrien#include "extern.h" 5778344Sobrien 58197144Shrs#define LHSZ 128 5978344Sobrien#define LHMASK (LHSZ - 1) 60197144Shrsstatic struct labhash { 61197144Shrs struct labhash *lh_next; 6298186Sgordon u_int lh_hash; 63197144Shrs struct s_command *lh_cmd; 64197144Shrs int lh_ref; 65197144Shrs} *labels[LHSZ]; 66197144Shrs 67197144Shrsstatic char *compile_addr(char *, struct s_addr *); 68197144Shrsstatic char *compile_ccl(char **, char *); 69197144Shrsstatic char *compile_delimited(char *, char *); 70197144Shrsstatic char *compile_flags(char *, struct s_subst *); 71197144Shrsstatic regex_t *compile_re(char *, int); 7298186Sgordonstatic char *compile_subst(char *, struct s_subst *); 7398186Sgordonstatic char *compile_text(void); 74197144Shrsstatic char *compile_tr(char *, struct s_tr **); 75197144Shrsstatic struct s_command 76197144Shrs **compile_stream(struct s_command **); 7798186Sgordonstatic char *duptoeol(char *, const char *); 78197144Shrsstatic void enterlabel(struct s_command *); 79197144Shrsstatic struct s_command 8098186Sgordon *findlabel(char *); 8198186Sgordonstatic void fixuplabel(struct s_command *, struct s_command *); 82197144Shrsstatic void uselabel(void); 83197144Shrs 84197144Shrs/* 85197144Shrs * Command specification. This is used to drive the command parser. 86197144Shrs */ 87197144Shrsstruct s_format { 88197144Shrs char code; /* Command code */ 89197144Shrs int naddr; /* Number of address args */ 90197144Shrs enum e_args args; /* Argument type */ 91197144Shrs}; 92197144Shrs 93197144Shrsstatic struct s_format cmd_fmts[] = { 94197144Shrs {'{', 2, GROUP}, 9598186Sgordon {'}', 0, ENDGROUP}, 9698186Sgordon {'a', 1, TEXT}, 9798186Sgordon {'b', 2, BRANCH}, 9898186Sgordon {'c', 2, TEXT}, 99197144Shrs {'d', 2, EMPTY}, 100197144Shrs {'D', 2, EMPTY}, 101197144Shrs {'g', 2, EMPTY}, 10298186Sgordon {'G', 2, EMPTY}, 103197144Shrs {'h', 2, EMPTY}, 104197144Shrs {'H', 2, EMPTY}, 105197144Shrs {'i', 1, TEXT}, 106197144Shrs {'l', 2, EMPTY}, 107197144Shrs {'n', 2, EMPTY}, 108197144Shrs {'N', 2, EMPTY}, 109197144Shrs {'p', 2, EMPTY}, 110197144Shrs {'P', 2, EMPTY}, 111197144Shrs {'q', 1, EMPTY}, 112197144Shrs {'r', 1, RFILE}, 113197144Shrs {'s', 2, SUBST}, 114197144Shrs {'t', 2, BRANCH}, 115197144Shrs {'w', 2, WFILE}, 11698186Sgordon {'x', 2, EMPTY}, 11798186Sgordon {'y', 2, TR}, 11898186Sgordon {'!', 2, NONSEL}, 11998186Sgordon {':', 0, LABEL}, 12098186Sgordon {'#', 0, COMMENT}, 12198186Sgordon {'=', 1, EMPTY}, 12298186Sgordon {'\0', 0, COMMENT}, 12398186Sgordon}; 12498186Sgordon 12598186Sgordon/* The compiled program. */ 12698186Sgordonstruct s_command *prog; 127146490Sschweikh 12898186Sgordon/* 12998186Sgordon * Compile the program into prog. 13098186Sgordon * Initialise appends. 13198186Sgordon */ 13298186Sgordonvoid 13398186Sgordoncompile(void) 13498186Sgordon{ 13578344Sobrien *compile_stream(&prog) = NULL; 13678344Sobrien fixuplabel(prog, NULL); 13778344Sobrien uselabel(); 13878344Sobrien if (appendnum == 0) 13978344Sobrien appends = NULL; 14078344Sobrien else if ((appends = malloc(sizeof(struct s_appends) * appendnum)) == 14178344Sobrien NULL) 14298186Sgordon err(1, "malloc"); 14378344Sobrien if ((match = malloc((maxnsub + 1) * sizeof(regmatch_t))) == NULL) 14478344Sobrien err(1, "malloc"); 14578344Sobrien} 14678344Sobrien 14778344Sobrien#define EATSPACE() do { \ 14878344Sobrien if (p) \ 14978344Sobrien while (*p && isspace((unsigned char)*p)) \ 15078344Sobrien p++; \ 15178344Sobrien } while (0) 15278344Sobrien 15378344Sobrienstatic struct s_command ** 15478344Sobriencompile_stream(struct s_command **link) 155157473Sflz{ 15678344Sobrien char *p; 15778344Sobrien static char lbuf[_POSIX2_LINE_MAX + 1]; /* To save stack */ 15878344Sobrien struct s_command *cmd, *cmd2, *stack; 15978344Sobrien struct s_format *fp; 16078344Sobrien char re[_POSIX2_LINE_MAX + 1]; 161157473Sflz int naddr; /* Number of addresses */ 16298186Sgordon 16398186Sgordon stack = 0; 16478344Sobrien for (;;) { 16598186Sgordon if ((p = cu_fgets(lbuf, sizeof(lbuf), NULL)) == NULL) { 16698186Sgordon if (stack != 0) 16798186Sgordon errx(1, "%lu: %s: unexpected EOF (pending }'s)", 168126286Smtm linenum, fname); 16998186Sgordon return (link); 17098186Sgordon } 17198186Sgordon 17298186Sgordonsemicolon: EATSPACE(); 17398186Sgordon if (p) { 174169668Smtm if (*p == '#' || *p == '\0') 175169668Smtm continue; 176169668Smtm else if (*p == ';') { 177169668Smtm p++; 17878344Sobrien goto semicolon; 179169668Smtm } 180169668Smtm } 181169668Smtm if ((*link = cmd = malloc(sizeof(struct s_command))) == NULL) 182169668Smtm err(1, "malloc"); 183178776Smaxim link = &cmd->next; 184178776Smaxim cmd->nonsel = cmd->inrange = 0; 185178770Smtm /* First parse the addresses */ 186169668Smtm naddr = 0; 187178770Smtm 188178770Smtm/* Valid characters to start an address */ 189169668Smtm#define addrchar(c) (strchr("0123456789/\\$", (c))) 190178770Smtm if (addrchar(*p)) { 191178775Smaxim naddr++; 192169668Smtm if ((cmd->a1 = malloc(sizeof(struct s_addr))) == NULL) 193169668Smtm err(1, "malloc"); 194169668Smtm p = compile_addr(p, cmd->a1); 195169668Smtm EATSPACE(); /* EXTENSION */ 196169668Smtm if (*p == ',') { 197169668Smtm p++; 198169668Smtm EATSPACE(); /* EXTENSION */ 199169668Smtm naddr++; 20098186Sgordon if ((cmd->a2 = malloc(sizeof(struct s_addr))) 20198186Sgordon == NULL) 20298186Sgordon err(1, "malloc"); 20398186Sgordon p = compile_addr(p, cmd->a2); 20498186Sgordon EATSPACE(); 20578344Sobrien } else 20678344Sobrien cmd->a2 = 0; 20798186Sgordon } else 20878344Sobrien cmd->a1 = cmd->a2 = 0; 20978344Sobrien 210126285Smtmnonsel: /* Now parse the command */ 21178344Sobrien if (!*p) 21278344Sobrien errx(1, "%lu: %s: command expected", linenum, fname); 213126285Smtm cmd->code = *p; 21478344Sobrien for (fp = cmd_fmts; fp->code; fp++) 21578344Sobrien if (fp->code == *p) 216126285Smtm break; 217126285Smtm if (!fp->code) 218126285Smtm errx(1, "%lu: %s: invalid command code %c", linenum, fname, *p); 21978344Sobrien if (naddr > fp->naddr) 22078344Sobrien errx(1, 22198186Sgordon "%lu: %s: command %c expects up to %d address(es), found %d", 22278344Sobrien linenum, fname, *p, fp->naddr, naddr); 22378344Sobrien switch (fp->args) { 22478344Sobrien case NONSEL: /* ! */ 22578344Sobrien p++; 22698186Sgordon EATSPACE(); 22798186Sgordon cmd->nonsel = ! cmd->nonsel; 22878344Sobrien goto nonsel; 22998186Sgordon case GROUP: /* { */ 23098186Sgordon p++; 23178344Sobrien EATSPACE(); 23278344Sobrien cmd->next = stack; 23378344Sobrien stack = cmd; 23478344Sobrien link = &cmd->u.c; 23578344Sobrien if (*p) 23698186Sgordon goto semicolon; 23778344Sobrien break; 23898186Sgordon case ENDGROUP: 23978344Sobrien /* 24078344Sobrien * Short-circuit command processing, since end of 241131061Smtm * group is really just a noop. 24278344Sobrien */ 24378344Sobrien cmd->nonsel = 1; 24478344Sobrien if (stack == 0) 24578344Sobrien errx(1, "%lu: %s: unexpected }", linenum, fname); 246139949Skeramida cmd2 = stack; 24778344Sobrien stack = cmd2->next; 24878344Sobrien cmd2->next = cmd; 24998186Sgordon /*FALLTHROUGH*/ 25078344Sobrien case EMPTY: /* d D g G h H l n N p P q x = \0 */ 25178344Sobrien p++; 25278344Sobrien EATSPACE(); 25398186Sgordon if (*p == ';') { 25478344Sobrien p++; 25598186Sgordon link = &cmd->next; 25698186Sgordon goto semicolon; 25778344Sobrien } 25878344Sobrien if (*p) 25978344Sobrien errx(1, "%lu: %s: extra characters at the end of %c command", 26078344Sobrien linenum, fname, cmd->code); 26198186Sgordon break; 26278344Sobrien case TEXT: /* a c i */ 26398186Sgordon p++; 26478344Sobrien EATSPACE(); 26598186Sgordon if (*p != '\\') 26698186Sgordon errx(1, 26798186Sgordon"%lu: %s: command %c expects \\ followed by text", linenum, fname, cmd->code); 26898186Sgordon p++; 26998186Sgordon EATSPACE(); 27098186Sgordon if (*p) 27198186Sgordon errx(1, 27298186Sgordon "%lu: %s: extra characters after \\ at the end of %c command", 27398186Sgordon linenum, fname, cmd->code); 27498186Sgordon cmd->t = compile_text(); 27598186Sgordon break; 27698186Sgordon case COMMENT: /* \0 # */ 27798186Sgordon break; 27898186Sgordon case WFILE: /* w */ 279155719Sceri p++; 28098186Sgordon EATSPACE(); 28198186Sgordon if (*p == '\0') 28298186Sgordon errx(1, "%lu: %s: filename expected", linenum, fname); 28398186Sgordon cmd->t = duptoeol(p, "w command"); 284157841Sflz if (aflag) 285157841Sflz cmd->u.fd = -1; 286157841Sflz else if ((cmd->u.fd = open(p, 28798186Sgordon O_WRONLY|O_APPEND|O_CREAT|O_TRUNC, 28898186Sgordon DEFFILEMODE)) == -1) 28998186Sgordon err(1, "%s", p); 29098186Sgordon break; 29198186Sgordon case RFILE: /* r */ 29298186Sgordon p++; 29398186Sgordon EATSPACE(); 29498186Sgordon if (*p == '\0') 29598186Sgordon errx(1, "%lu: %s: filename expected", linenum, fname); 29698186Sgordon else 29778344Sobrien cmd->t = duptoeol(p, "read command"); 29898186Sgordon break; 299170282Syar case BRANCH: /* b t */ 300170282Syar p++; 301170282Syar EATSPACE(); 302170282Syar if (*p == '\0') 303170282Syar cmd->t = NULL; 304170282Syar else 305170282Syar cmd->t = duptoeol(p, "branch"); 306170282Syar break; 307170282Syar case LABEL: /* : */ 308170282Syar p++; 309170282Syar EATSPACE(); 310170282Syar cmd->t = duptoeol(p, "label"); 311170282Syar if (strlen(p) == 0) 312170282Syar errx(1, "%lu: %s: empty label", linenum, fname); 313170282Syar enterlabel(cmd); 314170282Syar break; 315170282Syar case SUBST: /* s */ 316170282Syar p++; 317170282Syar if (*p == '\0' || *p == '\\') 318170282Syar errx(1, 319170282Syar"%lu: %s: substitute pattern can not be delimited by newline or backslash", 320170282Syar linenum, fname); 321170282Syar if ((cmd->u.s = malloc(sizeof(struct s_subst))) == NULL) 322170282Syar err(1, "malloc"); 32378344Sobrien p = compile_delimited(p, re); 32498186Sgordon if (p == NULL) 325157841Sflz errx(1, 32698186Sgordon "%lu: %s: unterminated substitute pattern", linenum, fname); 32798186Sgordon if (*re == '\0') 328157841Sflz cmd->u.s->re = NULL; 32998186Sgordon else 33098186Sgordon cmd->u.s->re = compile_re(re, cmd->u.s->icase); 33198186Sgordon --p; 33298186Sgordon p = compile_subst(p, cmd->u.s); 333151426Sjhb p = compile_flags(p, cmd->u.s); 33498186Sgordon EATSPACE(); 33598186Sgordon if (*p == ';') { 336161435Syar p++; 337161436Syar link = &cmd->next; 338157657Sflz goto semicolon; 339161436Syar } 340157657Sflz break; 341157657Sflz case TR: /* y */ 342157657Sflz p++; 343157657Sflz p = compile_tr(p, &cmd->u.y); 34498186Sgordon EATSPACE(); 34598186Sgordon if (*p == ';') { 34698186Sgordon p++; 34798186Sgordon link = &cmd->next; 348114272Smtm goto semicolon; 34998186Sgordon } 35098186Sgordon if (*p) 35198186Sgordon errx(1, 35298186Sgordon"%lu: %s: extra text at the end of a transform command", linenum, fname); 35398186Sgordon break; 35498186Sgordon } 35598186Sgordon } 35698186Sgordon} 35798186Sgordon 358206248Sdougb/* 359206248Sdougb * Get a delimited string. P points to the delimeter of the string; d points 360126286Smtm * to a buffer area. Newline and delimiter escapes are processed; other 36198186Sgordon * escapes are ignored. 36298186Sgordon * 36398186Sgordon * Returns a pointer to the first character after the final delimiter or NULL 36498186Sgordon * in the case of a non-terminated string. The character array d is filled 36598186Sgordon * with the processed string. 36698186Sgordon */ 36798186Sgordonstatic char * 36898186Sgordoncompile_delimited(char *p, char *d) 36998186Sgordon{ 370206248Sdougb char c; 37198186Sgordon 37298186Sgordon c = *p++; 37398186Sgordon if (c == '\0') 37498186Sgordon return (NULL); 37578344Sobrien else if (c == '\\') 37698186Sgordon errx(1, "%lu: %s: \\ can not be used as a string delimiter", 37798186Sgordon linenum, fname); 37898186Sgordon else if (c == '\n') 379206248Sdougb errx(1, "%lu: %s: newline can not be used as a string delimiter", 38078344Sobrien linenum, fname); 38198186Sgordon while (*p) { 38298186Sgordon if (*p == '[') { 38398186Sgordon if ((d = compile_ccl(&p, d)) == NULL) 38478344Sobrien errx(1, "%lu: %s: unbalanced brackets ([])", linenum, fname); 38578344Sobrien continue; 38678344Sobrien } else if (*p == '\\' && p[1] == '[') { 387220962Sdougb *d++ = *p++; 388220962Sdougb } else if (*p == '\\' && p[1] == c) 389220962Sdougb p++; 390220962Sdougb else if (*p == '\\' && p[1] == 'n') { 391220962Sdougb *d++ = '\n'; 392220962Sdougb p += 2; 393220962Sdougb continue; 394220962Sdougb } else if (*p == '\\' && p[1] == '\\') 395220962Sdougb *d++ = *p++; 396220962Sdougb else if (*p == c) { 397220962Sdougb *d = '\0'; 398220962Sdougb return (p + 1); 399220962Sdougb } 400220962Sdougb *d++ = *p++; 401220962Sdougb } 402220962Sdougb return (NULL); 403220962Sdougb} 404220962Sdougb 405220962Sdougb 406220962Sdougb/* compile_ccl: expand a POSIX character class */ 407220962Sdougbstatic char * 408220962Sdougbcompile_ccl(char **sp, char *t) 409220962Sdougb{ 410220962Sdougb int c, d; 411220962Sdougb char *s = *sp; 412220962Sdougb 413220962Sdougb *t++ = *s++; 414220962Sdougb if (*s == '^') 415220962Sdougb *t++ = *s++; 416220962Sdougb if (*s == ']') 417220962Sdougb *t++ = *s++; 418220962Sdougb for (; *s && (*t = *s) != ']'; s++, t++) 419220962Sdougb if (*s == '[' && ((d = *(s+1)) == '.' || d == ':' || d == '=')) { 420220962Sdougb *++t = *++s, t++, s++; 421220962Sdougb for (c = *s; (*t = *s) != ']' || c != d; s++, t++) 422220962Sdougb if ((c = *s) == '\0') 423220962Sdougb return NULL; 424220962Sdougb } else if (*s == '\\' && s[1] == 'n') 425220962Sdougb *t = '\n', s++; 426197947Sdougb return (*s == ']') ? *sp = ++s, ++t : NULL; 427197947Sdougb} 428197947Sdougb 429197947Sdougb/* 430197947Sdougb * Compiles the regular expression in RE and returns a pointer to the compiled 431197947Sdougb * regular expression. 432197947Sdougb * Cflags are passed to regcomp. 433197947Sdougb */ 434197947Sdougbstatic regex_t * 435197947Sdougbcompile_re(char *re, int case_insensitive) 436197947Sdougb{ 437197947Sdougb regex_t *rep; 438197947Sdougb int eval, flags; 439197947Sdougb 44098186Sgordon 44198186Sgordon flags = rflags; 44298186Sgordon if (case_insensitive) 44398186Sgordon flags |= REG_ICASE; 44498186Sgordon if ((rep = malloc(sizeof(regex_t))) == NULL) 44578344Sobrien err(1, "malloc"); 44698186Sgordon if (eval = regcomp(rep, re, flags) != 0) 44798186Sgordon errx(1, "%lu: %s: RE error: %s", 44878344Sobrien linenum, fname, strregerror(eval, rep)); 449175676Smtm if (maxnsub < rep->re_nsub) 45098186Sgordon maxnsub = rep->re_nsub; 451126303Smtm return (rep); 452175676Smtm} 45378344Sobrien 45478344Sobrien/* 45578344Sobrien * Compile the substitution string of a regular expression and set res to 45698186Sgordon * point to a saved copy of it. Nsub is the number of parenthesized regular 45798186Sgordon * expressions. 45878344Sobrien */ 45978344Sobrienstatic char * 46078344Sobriencompile_subst(char *p, struct s_subst *s) 46198186Sgordon{ 46278344Sobrien static char lbuf[_POSIX2_LINE_MAX + 1]; 46378344Sobrien int asize, size; 46478344Sobrien u_char ref; 46578344Sobrien char c, *text, *op, *sp; 46698186Sgordon int more = 1, sawesc = 0; 46798186Sgordon 46898186Sgordon c = *p++; /* Terminator character */ 469197144Shrs if (c == '\0') 470197144Shrs return (NULL); 47178344Sobrien 47278344Sobrien s->maxbref = 0; 47398186Sgordon s->linenum = linenum; 47498186Sgordon asize = 2 * _POSIX2_LINE_MAX + 1; 47598186Sgordon if ((text = malloc(asize)) == NULL) 47678344Sobrien err(1, "malloc"); 47798186Sgordon size = 0; 47898186Sgordon do { 47978344Sobrien op = sp = text + size; 48078344Sobrien for (; *p; p++) { 48178344Sobrien if (*p == '\\' || sawesc) { 482157653Sflz /* 483157653Sflz * If this is a continuation from the last 484157653Sflz * buffer, we won't have a character to 485157653Sflz * skip over. 48678344Sobrien */ 48798186Sgordon if (sawesc) 48878344Sobrien sawesc = 0; 48978344Sobrien else 49078344Sobrien p++; 49178344Sobrien 49278344Sobrien if (*p == '\0') { 49378344Sobrien /* 49478344Sobrien * This escaped character is continued 49578344Sobrien * in the next part of the line. Note 49678344Sobrien * this fact, then cause the loop to 49778344Sobrien * exit w/ normal EOL case and reenter 49878344Sobrien * above with the new buffer. 49978344Sobrien */ 50098186Sgordon sawesc = 1; 50178344Sobrien p--; 50278344Sobrien continue; 50398186Sgordon } else if (strchr("123456789", *p) != NULL) { 50478344Sobrien *sp++ = '\\'; 50598186Sgordon ref = *p - '0'; 50698186Sgordon if (s->re != NULL && 50798186Sgordon ref > s->re->re_nsub) 50878344Sobrien errx(1, "%lu: %s: \\%c not defined in the RE", 50998186Sgordon linenum, fname, *p); 51078344Sobrien if (s->maxbref < ref) 51178344Sobrien s->maxbref = ref; 51298186Sgordon } else if (*p == '&' || *p == '\\') 51398186Sgordon *sp++ = '\\'; 51498186Sgordon } else if (*p == c) { 51598186Sgordon if (*++p == '\0' && more) { 51678344Sobrien if (cu_fgets(lbuf, sizeof(lbuf), &more)) 51798186Sgordon p = lbuf; 51878344Sobrien } 51998186Sgordon *sp++ = '\0'; 52098186Sgordon size += sp - op; 52198186Sgordon if ((s->new = realloc(text, size)) == NULL) 52298186Sgordon err(1, "realloc"); 52378344Sobrien return (p); 524165565Syar } else if (*p == '\n') { 52578344Sobrien errx(1, 52678344Sobrien"%lu: %s: unescaped newline inside substitute pattern", linenum, fname); 527165565Syar /* NOTREACHED */ 52878344Sobrien } 529165565Syar *sp++ = *p; 530165565Syar } 531165565Syar size += sp - op; 532165565Syar if (asize - size < _POSIX2_LINE_MAX + 1) { 533165565Syar asize *= 2; 534165565Syar if ((text = realloc(text, asize)) == NULL) 535165565Syar err(1, "realloc"); 536165565Syar } 537165565Syar } while (cu_fgets(p = lbuf, sizeof(lbuf), &more)); 538165565Syar errx(1, "%lu: %s: unterminated substitute in regular expression", 539165565Syar linenum, fname); 540165565Syar /* NOTREACHED */ 541165565Syar} 542165565Syar 543165565Syar/* 54478344Sobrien * Compile the flags of the s command 54578344Sobrien */ 54678344Sobrienstatic char * 54778344Sobriencompile_flags(char *p, struct s_subst *s) 54898186Sgordon{ 54998186Sgordon int gn; /* True if we have seen g or n */ 55078344Sobrien unsigned long nval; 55198186Sgordon char wfile[_POSIX2_LINE_MAX + 1], *q; 55298186Sgordon 55378344Sobrien s->n = 1; /* Default */ 55478344Sobrien s->p = 0; 55578344Sobrien s->wfile = NULL; 55678344Sobrien s->wfd = -1; 55798186Sgordon s->icase = 0; 55878344Sobrien for (gn = 0;;) { 55998186Sgordon EATSPACE(); /* EXTENSION */ 56098186Sgordon switch (*p) { 56198186Sgordon case 'g': 56298186Sgordon if (gn) 56378344Sobrien errx(1, 56498186Sgordon"%lu: %s: more than one number or 'g' in substitute flags", linenum, fname); 56598186Sgordon gn = 1; 56678344Sobrien s->n = 0; 567151685Syar break; 568151685Syar case '\0': 56978344Sobrien case '\n': 57078344Sobrien case ';': 57178344Sobrien return (p); 57298186Sgordon case 'p': 57378344Sobrien s->p = 1; 57498186Sgordon break; 57598186Sgordon case 'I': 57698186Sgordon s->icase = 1; 57798186Sgordon break; 57898186Sgordon case '1': case '2': case '3': 57998186Sgordon case '4': case '5': case '6': 58098186Sgordon case '7': case '8': case '9': 58198186Sgordon if (gn) 58298186Sgordon errx(1, 583126303Smtm"%lu: %s: more than one number or 'g' in substitute flags", linenum, fname); 58498186Sgordon gn = 1; 58598186Sgordon errno = 0; 58698186Sgordon nval = strtol(p, &p, 10); 58798186Sgordon if (errno == ERANGE || nval > INT_MAX) 58898186Sgordon errx(1, 58998186Sgordon"%lu: %s: overflow in the 'N' substitute flag", linenum, fname); 59098186Sgordon s->n = nval; 59198186Sgordon p--; 59298186Sgordon break; 59398186Sgordon case 'w': 59498186Sgordon p++; 59598186Sgordon#ifdef HISTORIC_PRACTICE 59698186Sgordon if (*p != ' ') { 597175676Smtm warnx("%lu: %s: space missing before w wfile", linenum, fname); 59898186Sgordon return (p); 599175676Smtm } 60078344Sobrien#endif 60178344Sobrien EATSPACE(); 602116097Smtm q = wfile; 60398186Sgordon while (*p) { 60478344Sobrien if (*p == '\n') 60598186Sgordon break; 60678344Sobrien *q++ = *p++; 60778344Sobrien } 608132892Smtm *q = '\0'; 609132892Smtm if (q == wfile) 610132892Smtm errx(1, "%lu: %s: no wfile specified", linenum, fname); 611132892Smtm s->wfile = strdup(wfile); 612132892Smtm if (!aflag && (s->wfd = open(wfile, 613132892Smtm O_WRONLY|O_APPEND|O_CREAT|O_TRUNC, 614126303Smtm DEFFILEMODE)) == -1) 61598186Sgordon err(1, "%s", wfile); 61678344Sobrien return (p); 61798186Sgordon default: 61898186Sgordon errx(1, "%lu: %s: bad flag in substitute command: '%c'", 619175676Smtm linenum, fname, *p); 62078344Sobrien break; 621198216Sed } 62298186Sgordon p++; 623126303Smtm } 624126303Smtm} 62578344Sobrien 62678344Sobrien/* 62778344Sobrien * Compile a translation set of strings into a lookup table. 62878344Sobrien */ 629126303Smtmstatic char * 630126303Smtmcompile_tr(char *p, struct s_tr **py) 631126303Smtm{ 632126303Smtm struct s_tr *y; 633126303Smtm int i; 634126303Smtm const char *op, *np; 635126303Smtm char old[_POSIX2_LINE_MAX + 1]; 636175676Smtm char new[_POSIX2_LINE_MAX + 1]; 637175676Smtm size_t oclen, oldlen, nclen, newlen; 638175676Smtm mbstate_t mbs1, mbs2; 639175676Smtm 640175676Smtm if ((*py = y = malloc(sizeof(*y))) == NULL) 64178344Sobrien err(1, NULL); 64278344Sobrien y->multis = NULL; 643161530Sflz y->nmultis = 0; 644198162Sdougb 645161530Sflz if (*p == '\0' || *p == '\\') 64678344Sobrien errx(1, 64798186Sgordon "%lu: %s: transform pattern can not be delimited by newline or backslash", 64878344Sobrien linenum, fname); 64998186Sgordon p = compile_delimited(p, old); 65098186Sgordon if (p == NULL) 651131135Smtm errx(1, "%lu: %s: unterminated transform source string", 652131135Smtm linenum, fname); 65378344Sobrien p = compile_delimited(p - 1, new); 65498186Sgordon if (p == NULL) 65598186Sgordon errx(1, "%lu: %s: unterminated transform target string", 65698186Sgordon linenum, fname); 65778344Sobrien EATSPACE(); 65878344Sobrien op = old; 65998186Sgordon oldlen = mbsrtowcs(NULL, &op, 0, NULL); 66078344Sobrien if (oldlen == (size_t)-1) 66178344Sobrien err(1, NULL); 66278344Sobrien np = new; 66398186Sgordon newlen = mbsrtowcs(NULL, &np, 0, NULL); 664150796Syar if (newlen == (size_t)-1) 66578344Sobrien err(1, NULL); 66678344Sobrien if (newlen != oldlen) 66778344Sobrien errx(1, "%lu: %s: transform strings are not the same length", 66898186Sgordon linenum, fname); 66978344Sobrien if (MB_CUR_MAX == 1) { 67098186Sgordon /* 67178344Sobrien * The single-byte encoding case is easy: generate a 67298186Sgordon * lookup table. 67398186Sgordon */ 67498186Sgordon for (i = 0; i <= UCHAR_MAX; i++) 67578344Sobrien y->bytetab[i] = (char)i; 67698186Sgordon for (; *op; op++, np++) 677124832Smtm y->bytetab[(u_char)*op] = *np; 67898186Sgordon } else { 67998186Sgordon /* 68098186Sgordon * Multi-byte encoding case: generate a lookup table as 68198186Sgordon * above, but only for single-byte characters. The first 682179870Smtm * bytes of multi-byte characters have their lookup table 683179870Smtm * entries set to 0, which causes do_tr() to search through 684179870Smtm * an auxiliary vector of multi-byte mappings. 685179870Smtm */ 686179870Smtm memset(&mbs1, 0, sizeof(mbs1)); 687179870Smtm memset(&mbs2, 0, sizeof(mbs2)); 688206686Sdougb for (i = 0; i <= UCHAR_MAX; i++) 689206686Sdougb y->bytetab[i] = (btowc(i) != WEOF) ? i : 0; 69078344Sobrien while (*op != '\0') { 69178344Sobrien oclen = mbrlen(op, MB_LEN_MAX, &mbs1); 69278344Sobrien if (oclen == (size_t)-1 || oclen == (size_t)-2) 693220760Sdougb errc(1, EILSEQ, NULL); 694220760Sdougb nclen = mbrlen(np, MB_LEN_MAX, &mbs2); 695179870Smtm if (nclen == (size_t)-1 || nclen == (size_t)-2) 696179870Smtm errc(1, EILSEQ, NULL); 697179870Smtm if (oclen == 1 && nclen == 1) 698179870Smtm y->bytetab[(u_char)*op] = *np; 699179870Smtm else { 700179870Smtm y->bytetab[(u_char)*op] = 0; 701179870Smtm y->multis = realloc(y->multis, 702175676Smtm (y->nmultis + 1) * sizeof(*y->multis)); 703175676Smtm if (y->multis == NULL) 70478344Sobrien err(1, NULL); 70578344Sobrien i = y->nmultis++; 70678344Sobrien y->multis[i].fromlen = oclen; 70778344Sobrien memcpy(y->multis[i].from, op, oclen); 70878344Sobrien y->multis[i].tolen = nclen; 709165565Syar memcpy(y->multis[i].to, np, nclen); 710165565Syar } 711165565Syar op += oclen; 712165565Syar np += nclen; 71378344Sobrien } 714165565Syar } 715165565Syar return (p); 716165565Syar} 717116097Smtm 71878344Sobrien/* 71978344Sobrien * Compile the text following an a or i command. 72098186Sgordon */ 72178344Sobrienstatic char * 72278344Sobriencompile_text(void) 723165565Syar{ 72498186Sgordon int asize, esc_nl, size; 72598186Sgordon char *text, *p, *op, *s; 72678344Sobrien char lbuf[_POSIX2_LINE_MAX + 1]; 72778344Sobrien 72878344Sobrien asize = 2 * _POSIX2_LINE_MAX + 1; 72978344Sobrien if ((text = malloc(asize)) == NULL) 730165565Syar err(1, "malloc"); 73178344Sobrien size = 0; 73278344Sobrien while (cu_fgets(lbuf, sizeof(lbuf), NULL)) { 73378344Sobrien op = s = text + size; 734131135Smtm p = lbuf; 735157473Sflz EATSPACE(); 736153152Syar for (esc_nl = 0; *p != '\0'; p++) { 73778344Sobrien if (*p == '\\' && p[1] != '\0' && *++p == '\n') 73878344Sobrien esc_nl = 1; 739167413Syar *s++ = *p; 740160667Syar } 741153152Syar size += s - op; 74278344Sobrien if (!esc_nl) { 74378344Sobrien *s = '\0'; 744179946Smtm break; 745179946Smtm } 746179946Smtm if (asize - size < _POSIX2_LINE_MAX + 1) { 747179946Smtm asize *= 2; 74878344Sobrien if ((text = realloc(text, asize)) == NULL) 749160668Syar err(1, "realloc"); 75078344Sobrien } 751197947Sdougb } 75278344Sobrien text[size] = '\0'; 75378344Sobrien if ((p = realloc(text, size + 1)) == NULL) 75478344Sobrien err(1, "realloc"); 75578344Sobrien return (p); 75698186Sgordon} 75778344Sobrien 75878344Sobrien/* 759161396Syar * Get an address and return a pointer to the first character after 76098186Sgordon * it. Fill the structure pointed to according to the address. 76198186Sgordon */ 76298186Sgordonstatic char * 76398186Sgordoncompile_addr(char *p, struct s_addr *a) 764161396Syar{ 765161396Syar char *end, re[_POSIX2_LINE_MAX + 1]; 766161396Syar int icase; 767201036Sdougb 768161396Syar icase = 0; 769161396Syar 77078344Sobrien switch (*p) { 77198186Sgordon case '\\': /* Context address */ 772165565Syar ++p; 77398186Sgordon /* FALLTHROUGH */ 774179946Smtm case '/': /* Context address */ 775179946Smtm p = compile_delimited(p, re); 776179946Smtm if (p == NULL) 777179946Smtm errx(1, "%lu: %s: unterminated regular expression", linenum, fname); 77898186Sgordon /* Check for case insensitive regexp flag */ 77998186Sgordon if (*p == 'I') { 78098186Sgordon icase = 1; 781165565Syar p++; 78278344Sobrien } 78378344Sobrien if (*re == '\0') 78478344Sobrien a->u.r = NULL; 78598186Sgordon else 786153152Syar a->u.r = compile_re(re, icase); 787165565Syar a->type = AT_RE; 788153152Syar return (p); 78978344Sobrien 79078344Sobrien case '$': /* Last line */ 791165565Syar a->type = AT_LAST; 79298186Sgordon return (p + 1); 79398186Sgordon /* Line number */ 79498186Sgordon case '0': case '1': case '2': case '3': case '4': 79578344Sobrien case '5': case '6': case '7': case '8': case '9': 796165565Syar a->type = AT_LINE; 797165565Syar a->u.l = strtol(p, &end, 10); 79898186Sgordon return (end); 79998186Sgordon default: 80098186Sgordon errx(1, "%lu: %s: expected context address", linenum, fname); 80198186Sgordon return (NULL); 802165565Syar } 803165565Syar} 80478344Sobrien 80578344Sobrien/* 80678344Sobrien * duptoeol -- 80798186Sgordon * Return a copy of all the characters up to \n or \0. 808165565Syar */ 809153152Syarstatic char * 81078344Sobrienduptoeol(char *s, const char *ctype) 811165565Syar{ 812165565Syar size_t len; 813165565Syar int ws; 814165565Syar char *p, *start; 815165565Syar 816165565Syar ws = 0; 817165565Syar for (start = s; *s != '\0' && *s != '\n'; ++s) 81878344Sobrien ws = isspace((unsigned char)*s); 81978344Sobrien *s = '\0'; 82078344Sobrien if (ws) 82178344Sobrien warnx("%lu: %s: whitespace after %s", linenum, fname, ctype); 82278344Sobrien len = s - start + 1; 82378344Sobrien if ((p = malloc(len)) == NULL) 824126285Smtm err(1, "malloc"); 82578344Sobrien return (memmove(p, start, len)); 82678344Sobrien} 827126285Smtm 82878344Sobrien/* 829165565Syar * Convert goto label names to addresses, and count a and r commands, in 830165565Syar * the given subset of the script. Free the memory used by labels in b 831165565Syar * and t commands (but not by :). 832152519Syar * 833165565Syar * TODO: Remove } nodes 834165565Syar */ 835165565Syarstatic void 83698186Sgordonfixuplabel(struct s_command *cp, struct s_command *end) 837165565Syar{ 83878344Sobrien 83978344Sobrien for (; cp != end; cp = cp->next) 84098186Sgordon switch (cp->code) { 841165565Syar case 'a': 84298186Sgordon case 'r': 84398186Sgordon appendnum++; 84498186Sgordon break; 845165565Syar case 'b': 84698186Sgordon case 't': 84798186Sgordon /* Resolve branch target. */ 84878344Sobrien if (cp->t == NULL) { 849197144Shrs cp->u.c = NULL; 850197144Shrs break; 851197144Shrs } 852197144Shrs if ((cp->u.c = findlabel(cp->t)) == NULL) 853197144Shrs errx(1, "%lu: %s: undefined label '%s'", linenum, fname, cp->t); 854197144Shrs free(cp->t); 855197144Shrs break; 856197144Shrs case '{': 857197144Shrs /* Do interior commands. */ 858197144Shrs fixuplabel(cp->u.c, cp->next); 859197144Shrs break; 860197144Shrs } 861197144Shrs} 862197144Shrs 863197144Shrs/* 864197144Shrs * Associate the given command label for later lookup. 865197144Shrs */ 866197144Shrsstatic void 867197144Shrsenterlabel(struct s_command *cp) 86878344Sobrien{ 869197144Shrs struct labhash **lhp, *lh; 870197144Shrs u_char *p; 871197144Shrs u_int h, c; 872197144Shrs 873197144Shrs for (h = 0, p = (u_char *)cp->t; (c = *p) != 0; p++) 874197144Shrs h = (h << 5) + h + c; 875197144Shrs lhp = &labels[h & LHMASK]; 876197144Shrs for (lh = *lhp; lh != NULL; lh = lh->lh_next) 877197144Shrs if (lh->lh_hash == h && strcmp(cp->t, lh->lh_cmd->t) == 0) 878197144Shrs errx(1, "%lu: %s: duplicate label '%s'", linenum, fname, cp->t); 879197144Shrs if ((lh = malloc(sizeof *lh)) == NULL) 880197144Shrs err(1, "malloc"); 881197144Shrs lh->lh_next = *lhp; 882197144Shrs lh->lh_hash = h; 883197144Shrs lh->lh_cmd = cp; 884197144Shrs lh->lh_ref = 0; 885197144Shrs *lhp = lh; 886197144Shrs} 887197144Shrs 888197144Shrs/* 889197144Shrs * Find the label contained in the command l in the command linked 890197144Shrs * list cp. L is excluded from the search. Return NULL if not found. 891197144Shrs */ 89278344Sobrienstatic struct s_command * 89378344Sobrienfindlabel(char *name) 89478344Sobrien{ 895150796Syar struct labhash *lh; 89678344Sobrien u_char *p; 89778344Sobrien u_int h, c; 89878344Sobrien 899116097Smtm for (h = 0, p = (u_char *)name; (c = *p) != 0; p++) 90078344Sobrien h = (h << 5) + h + c; 90178344Sobrien for (lh = labels[h & LHMASK]; lh != NULL; lh = lh->lh_next) { 90298186Sgordon if (lh->lh_hash == h && strcmp(name, lh->lh_cmd->t) == 0) { 903150796Syar lh->lh_ref = 1; 904153152Syar return (lh->lh_cmd); 90578344Sobrien } 90678344Sobrien } 90778344Sobrien return (NULL); 908165565Syar} 909165565Syar 910165565Syar/* 911165565Syar * Warn about any unused labels. As a side effect, release the label hash 912165565Syar * table space. 913165565Syar */ 914165565Syarstatic void 915165565Syaruselabel(void) 916165565Syar{ 917165565Syar struct labhash *lh, *next; 918165565Syar int i; 919165565Syar 920165565Syar for (i = 0; i < LHSZ; i++) { 921165565Syar for (lh = labels[i]; lh != NULL; lh = next) { 922165565Syar next = lh->lh_next; 923165565Syar if (!lh->lh_ref) 924165565Syar warnx("%lu: %s: unused label '%s'", 925165565Syar linenum, fname, lh->lh_cmd->t); 926165565Syar free(lh); 927165565Syar } 928165565Syar } 929165565Syar} 930165565Syar