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-rw-r--r--usr.bin/sed/compile.c946
1 files changed, 946 insertions, 0 deletions
diff --git a/usr.bin/sed/compile.c b/usr.bin/sed/compile.c
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+++ b/usr.bin/sed/compile.c
@@ -0,0 +1,946 @@
+/*-
+ * Copyright (c) 1992 Diomidis Spinellis.
+ * Copyright (c) 1992, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Diomidis Spinellis of Imperial College, University of London.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#ifndef lint
+static const char sccsid[] = "@(#)compile.c 8.1 (Berkeley) 6/6/93";
+#endif
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <ctype.h>
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <regex.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <wchar.h>
+
+#include "defs.h"
+#include "extern.h"
+
+#define LHSZ 128
+#define LHMASK (LHSZ - 1)
+static struct labhash {
+ struct labhash *lh_next;
+ u_int lh_hash;
+ struct s_command *lh_cmd;
+ int lh_ref;
+} *labels[LHSZ];
+
+static char *compile_addr(char *, struct s_addr *);
+static char *compile_ccl(char **, char *);
+static char *compile_delimited(char *, char *, int);
+static char *compile_flags(char *, struct s_subst *);
+static regex_t *compile_re(char *, int);
+static char *compile_subst(char *, struct s_subst *);
+static char *compile_text(void);
+static char *compile_tr(char *, struct s_tr **);
+static struct s_command
+ **compile_stream(struct s_command **);
+static char *duptoeol(char *, const char *);
+static void enterlabel(struct s_command *);
+static struct s_command
+ *findlabel(char *);
+static void fixuplabel(struct s_command *, struct s_command *);
+static void uselabel(void);
+
+/*
+ * Command specification. This is used to drive the command parser.
+ */
+struct s_format {
+ char code; /* Command code */
+ int naddr; /* Number of address args */
+ enum e_args args; /* Argument type */
+};
+
+static struct s_format cmd_fmts[] = {
+ {'{', 2, GROUP},
+ {'}', 0, ENDGROUP},
+ {'a', 1, TEXT},
+ {'b', 2, BRANCH},
+ {'c', 2, TEXT},
+ {'d', 2, EMPTY},
+ {'D', 2, EMPTY},
+ {'g', 2, EMPTY},
+ {'G', 2, EMPTY},
+ {'h', 2, EMPTY},
+ {'H', 2, EMPTY},
+ {'i', 1, TEXT},
+ {'l', 2, EMPTY},
+ {'n', 2, EMPTY},
+ {'N', 2, EMPTY},
+ {'p', 2, EMPTY},
+ {'P', 2, EMPTY},
+ {'q', 1, EMPTY},
+ {'r', 1, RFILE},
+ {'s', 2, SUBST},
+ {'t', 2, BRANCH},
+ {'w', 2, WFILE},
+ {'x', 2, EMPTY},
+ {'y', 2, TR},
+ {'!', 2, NONSEL},
+ {':', 0, LABEL},
+ {'#', 0, COMMENT},
+ {'=', 1, EMPTY},
+ {'\0', 0, COMMENT},
+};
+
+/* The compiled program. */
+struct s_command *prog;
+
+/*
+ * Compile the program into prog.
+ * Initialise appends.
+ */
+void
+compile(void)
+{
+ *compile_stream(&prog) = NULL;
+ fixuplabel(prog, NULL);
+ uselabel();
+ if (appendnum == 0)
+ appends = NULL;
+ else if ((appends = malloc(sizeof(struct s_appends) * appendnum)) ==
+ NULL)
+ err(1, "malloc");
+ if ((match = malloc((maxnsub + 1) * sizeof(regmatch_t))) == NULL)
+ err(1, "malloc");
+}
+
+#define EATSPACE() do { \
+ if (p) \
+ while (*p && isspace((unsigned char)*p)) \
+ p++; \
+ } while (0)
+
+static struct s_command **
+compile_stream(struct s_command **link)
+{
+ char *p;
+ static char lbuf[_POSIX2_LINE_MAX + 1]; /* To save stack */
+ struct s_command *cmd, *cmd2, *stack;
+ struct s_format *fp;
+ char re[_POSIX2_LINE_MAX + 1];
+ int naddr; /* Number of addresses */
+
+ stack = 0;
+ for (;;) {
+ if ((p = cu_fgets(lbuf, sizeof(lbuf), NULL)) == NULL) {
+ if (stack != 0)
+ errx(1, "%lu: %s: unexpected EOF (pending }'s)",
+ linenum, fname);
+ return (link);
+ }
+
+semicolon: EATSPACE();
+ if (p) {
+ if (*p == '#' || *p == '\0')
+ continue;
+ else if (*p == ';') {
+ p++;
+ goto semicolon;
+ }
+ }
+ if ((*link = cmd = malloc(sizeof(struct s_command))) == NULL)
+ err(1, "malloc");
+ link = &cmd->next;
+ cmd->startline = cmd->nonsel = 0;
+ /* First parse the addresses */
+ naddr = 0;
+
+/* Valid characters to start an address */
+#define addrchar(c) (strchr("0123456789/\\$", (c)))
+ if (addrchar(*p)) {
+ naddr++;
+ if ((cmd->a1 = malloc(sizeof(struct s_addr))) == NULL)
+ err(1, "malloc");
+ p = compile_addr(p, cmd->a1);
+ EATSPACE(); /* EXTENSION */
+ if (*p == ',') {
+ p++;
+ EATSPACE(); /* EXTENSION */
+ naddr++;
+ if ((cmd->a2 = malloc(sizeof(struct s_addr)))
+ == NULL)
+ err(1, "malloc");
+ p = compile_addr(p, cmd->a2);
+ EATSPACE();
+ } else
+ cmd->a2 = 0;
+ } else
+ cmd->a1 = cmd->a2 = 0;
+
+nonsel: /* Now parse the command */
+ if (!*p)
+ errx(1, "%lu: %s: command expected", linenum, fname);
+ cmd->code = *p;
+ for (fp = cmd_fmts; fp->code; fp++)
+ if (fp->code == *p)
+ break;
+ if (!fp->code)
+ errx(1, "%lu: %s: invalid command code %c", linenum, fname, *p);
+ if (naddr > fp->naddr)
+ errx(1,
+ "%lu: %s: command %c expects up to %d address(es), found %d",
+ linenum, fname, *p, fp->naddr, naddr);
+ switch (fp->args) {
+ case NONSEL: /* ! */
+ p++;
+ EATSPACE();
+ cmd->nonsel = 1;
+ goto nonsel;
+ case GROUP: /* { */
+ p++;
+ EATSPACE();
+ cmd->next = stack;
+ stack = cmd;
+ link = &cmd->u.c;
+ if (*p)
+ goto semicolon;
+ break;
+ case ENDGROUP:
+ /*
+ * Short-circuit command processing, since end of
+ * group is really just a noop.
+ */
+ cmd->nonsel = 1;
+ if (stack == 0)
+ errx(1, "%lu: %s: unexpected }", linenum, fname);
+ cmd2 = stack;
+ stack = cmd2->next;
+ cmd2->next = cmd;
+ /*FALLTHROUGH*/
+ case EMPTY: /* d D g G h H l n N p P q x = \0 */
+ p++;
+ EATSPACE();
+ if (*p == ';') {
+ p++;
+ link = &cmd->next;
+ goto semicolon;
+ }
+ if (*p)
+ errx(1, "%lu: %s: extra characters at the end of %c command",
+ linenum, fname, cmd->code);
+ break;
+ case TEXT: /* a c i */
+ p++;
+ EATSPACE();
+ if (*p != '\\')
+ errx(1,
+"%lu: %s: command %c expects \\ followed by text", linenum, fname, cmd->code);
+ p++;
+ EATSPACE();
+ if (*p)
+ errx(1,
+ "%lu: %s: extra characters after \\ at the end of %c command",
+ linenum, fname, cmd->code);
+ cmd->t = compile_text();
+ break;
+ case COMMENT: /* \0 # */
+ break;
+ case WFILE: /* w */
+ p++;
+ EATSPACE();
+ if (*p == '\0')
+ errx(1, "%lu: %s: filename expected", linenum, fname);
+ cmd->t = duptoeol(p, "w command");
+ if (aflag)
+ cmd->u.fd = -1;
+ else if ((cmd->u.fd = open(p,
+ O_WRONLY|O_APPEND|O_CREAT|O_TRUNC,
+ DEFFILEMODE)) == -1)
+ err(1, "%s", p);
+ break;
+ case RFILE: /* r */
+ p++;
+ EATSPACE();
+ if (*p == '\0')
+ errx(1, "%lu: %s: filename expected", linenum, fname);
+ else
+ cmd->t = duptoeol(p, "read command");
+ break;
+ case BRANCH: /* b t */
+ p++;
+ EATSPACE();
+ if (*p == '\0')
+ cmd->t = NULL;
+ else
+ cmd->t = duptoeol(p, "branch");
+ break;
+ case LABEL: /* : */
+ p++;
+ EATSPACE();
+ cmd->t = duptoeol(p, "label");
+ if (strlen(p) == 0)
+ errx(1, "%lu: %s: empty label", linenum, fname);
+ enterlabel(cmd);
+ break;
+ case SUBST: /* s */
+ p++;
+ if (*p == '\0' || *p == '\\')
+ errx(1,
+"%lu: %s: substitute pattern can not be delimited by newline or backslash",
+ linenum, fname);
+ if ((cmd->u.s = calloc(1, sizeof(struct s_subst))) == NULL)
+ err(1, "malloc");
+ p = compile_delimited(p, re, 0);
+ if (p == NULL)
+ errx(1,
+ "%lu: %s: unterminated substitute pattern", linenum, fname);
+
+ /* Compile RE with no case sensitivity temporarily */
+ if (*re == '\0')
+ cmd->u.s->re = NULL;
+ else
+ cmd->u.s->re = compile_re(re, 0);
+ --p;
+ p = compile_subst(p, cmd->u.s);
+ p = compile_flags(p, cmd->u.s);
+
+ /* Recompile RE with case sensitivity from "I" flag if any */
+ if (*re == '\0')
+ cmd->u.s->re = NULL;
+ else
+ cmd->u.s->re = compile_re(re, cmd->u.s->icase);
+ EATSPACE();
+ if (*p == ';') {
+ p++;
+ link = &cmd->next;
+ goto semicolon;
+ }
+ break;
+ case TR: /* y */
+ p++;
+ p = compile_tr(p, &cmd->u.y);
+ EATSPACE();
+ if (*p == ';') {
+ p++;
+ link = &cmd->next;
+ goto semicolon;
+ }
+ if (*p)
+ errx(1,
+"%lu: %s: extra text at the end of a transform command", linenum, fname);
+ break;
+ }
+ }
+}
+
+/*
+ * Get a delimited string. P points to the delimeter of the string; d points
+ * to a buffer area. Newline and delimiter escapes are processed; other
+ * escapes are ignored.
+ *
+ * Returns a pointer to the first character after the final delimiter or NULL
+ * in the case of a non-terminated string. The character array d is filled
+ * with the processed string.
+ */
+static char *
+compile_delimited(char *p, char *d, int is_tr)
+{
+ char c;
+
+ c = *p++;
+ if (c == '\0')
+ return (NULL);
+ else if (c == '\\')
+ errx(1, "%lu: %s: \\ can not be used as a string delimiter",
+ linenum, fname);
+ else if (c == '\n')
+ errx(1, "%lu: %s: newline can not be used as a string delimiter",
+ linenum, fname);
+ while (*p) {
+ if (*p == '[' && *p != c) {
+ if ((d = compile_ccl(&p, d)) == NULL)
+ errx(1, "%lu: %s: unbalanced brackets ([])", linenum, fname);
+ continue;
+ } else if (*p == '\\' && p[1] == '[') {
+ *d++ = *p++;
+ } else if (*p == '\\' && p[1] == c)
+ p++;
+ else if (*p == '\\' && p[1] == 'n') {
+ *d++ = '\n';
+ p += 2;
+ continue;
+ } else if (*p == '\\' && p[1] == '\\') {
+ if (is_tr)
+ p++;
+ else
+ *d++ = *p++;
+ } else if (*p == c) {
+ *d = '\0';
+ return (p + 1);
+ }
+ *d++ = *p++;
+ }
+ return (NULL);
+}
+
+
+/* compile_ccl: expand a POSIX character class */
+static char *
+compile_ccl(char **sp, char *t)
+{
+ int c, d;
+ char *s = *sp;
+
+ *t++ = *s++;
+ if (*s == '^')
+ *t++ = *s++;
+ if (*s == ']')
+ *t++ = *s++;
+ for (; *s && (*t = *s) != ']'; s++, t++)
+ if (*s == '[' && ((d = *(s+1)) == '.' || d == ':' || d == '=')) {
+ *++t = *++s, t++, s++;
+ for (c = *s; (*t = *s) != ']' || c != d; s++, t++)
+ if ((c = *s) == '\0')
+ return NULL;
+ }
+ return (*s == ']') ? *sp = ++s, ++t : NULL;
+}
+
+/*
+ * Compiles the regular expression in RE and returns a pointer to the compiled
+ * regular expression.
+ * Cflags are passed to regcomp.
+ */
+static regex_t *
+compile_re(char *re, int case_insensitive)
+{
+ regex_t *rep;
+ int eval, flags;
+
+
+ flags = rflags;
+ if (case_insensitive)
+ flags |= REG_ICASE;
+ if ((rep = malloc(sizeof(regex_t))) == NULL)
+ err(1, "malloc");
+ if ((eval = regcomp(rep, re, flags)) != 0)
+ errx(1, "%lu: %s: RE error: %s",
+ linenum, fname, strregerror(eval, rep));
+ if (maxnsub < rep->re_nsub)
+ maxnsub = rep->re_nsub;
+ return (rep);
+}
+
+/*
+ * Compile the substitution string of a regular expression and set res to
+ * point to a saved copy of it. Nsub is the number of parenthesized regular
+ * expressions.
+ */
+static char *
+compile_subst(char *p, struct s_subst *s)
+{
+ static char lbuf[_POSIX2_LINE_MAX + 1];
+ int asize, size;
+ u_char ref;
+ char c, *text, *op, *sp;
+ int more = 1, sawesc = 0;
+
+ c = *p++; /* Terminator character */
+ if (c == '\0')
+ return (NULL);
+
+ s->maxbref = 0;
+ s->linenum = linenum;
+ asize = 2 * _POSIX2_LINE_MAX + 1;
+ if ((text = malloc(asize)) == NULL)
+ err(1, "malloc");
+ size = 0;
+ do {
+ op = sp = text + size;
+ for (; *p; p++) {
+ if (*p == '\\' || sawesc) {
+ /*
+ * If this is a continuation from the last
+ * buffer, we won't have a character to
+ * skip over.
+ */
+ if (sawesc)
+ sawesc = 0;
+ else
+ p++;
+
+ if (*p == '\0') {
+ /*
+ * This escaped character is continued
+ * in the next part of the line. Note
+ * this fact, then cause the loop to
+ * exit w/ normal EOL case and reenter
+ * above with the new buffer.
+ */
+ sawesc = 1;
+ p--;
+ continue;
+ } else if (strchr("123456789", *p) != NULL) {
+ *sp++ = '\\';
+ ref = *p - '0';
+ if (s->re != NULL &&
+ ref > s->re->re_nsub)
+ errx(1, "%lu: %s: \\%c not defined in the RE",
+ linenum, fname, *p);
+ if (s->maxbref < ref)
+ s->maxbref = ref;
+ } else if (*p == '&' || *p == '\\')
+ *sp++ = '\\';
+ } else if (*p == c) {
+ if (*++p == '\0' && more) {
+ if (cu_fgets(lbuf, sizeof(lbuf), &more))
+ p = lbuf;
+ }
+ *sp++ = '\0';
+ size += sp - op;
+ if ((s->new = realloc(text, size)) == NULL)
+ err(1, "realloc");
+ return (p);
+ } else if (*p == '\n') {
+ errx(1,
+"%lu: %s: unescaped newline inside substitute pattern", linenum, fname);
+ /* NOTREACHED */
+ }
+ *sp++ = *p;
+ }
+ size += sp - op;
+ if (asize - size < _POSIX2_LINE_MAX + 1) {
+ asize *= 2;
+ if ((text = realloc(text, asize)) == NULL)
+ err(1, "realloc");
+ }
+ } while (cu_fgets(p = lbuf, sizeof(lbuf), &more));
+ errx(1, "%lu: %s: unterminated substitute in regular expression",
+ linenum, fname);
+ /* NOTREACHED */
+}
+
+/*
+ * Compile the flags of the s command
+ */
+static char *
+compile_flags(char *p, struct s_subst *s)
+{
+ int gn; /* True if we have seen g or n */
+ unsigned long nval;
+ char wfile[_POSIX2_LINE_MAX + 1], *q;
+
+ s->n = 1; /* Default */
+ s->p = 0;
+ s->wfile = NULL;
+ s->wfd = -1;
+ s->icase = 0;
+ for (gn = 0;;) {
+ EATSPACE(); /* EXTENSION */
+ switch (*p) {
+ case 'g':
+ if (gn)
+ errx(1,
+"%lu: %s: more than one number or 'g' in substitute flags", linenum, fname);
+ gn = 1;
+ s->n = 0;
+ break;
+ case '\0':
+ case '\n':
+ case ';':
+ return (p);
+ case 'p':
+ s->p = 1;
+ break;
+ case 'I':
+ s->icase = 1;
+ break;
+ case '1': case '2': case '3':
+ case '4': case '5': case '6':
+ case '7': case '8': case '9':
+ if (gn)
+ errx(1,
+"%lu: %s: more than one number or 'g' in substitute flags", linenum, fname);
+ gn = 1;
+ errno = 0;
+ nval = strtol(p, &p, 10);
+ if (errno == ERANGE || nval > INT_MAX)
+ errx(1,
+"%lu: %s: overflow in the 'N' substitute flag", linenum, fname);
+ s->n = nval;
+ p--;
+ break;
+ case 'w':
+ p++;
+#ifdef HISTORIC_PRACTICE
+ if (*p != ' ') {
+ warnx("%lu: %s: space missing before w wfile", linenum, fname);
+ return (p);
+ }
+#endif
+ EATSPACE();
+ q = wfile;
+ while (*p) {
+ if (*p == '\n')
+ break;
+ *q++ = *p++;
+ }
+ *q = '\0';
+ if (q == wfile)
+ errx(1, "%lu: %s: no wfile specified", linenum, fname);
+ s->wfile = strdup(wfile);
+ if (!aflag && (s->wfd = open(wfile,
+ O_WRONLY|O_APPEND|O_CREAT|O_TRUNC,
+ DEFFILEMODE)) == -1)
+ err(1, "%s", wfile);
+ return (p);
+ default:
+ errx(1, "%lu: %s: bad flag in substitute command: '%c'",
+ linenum, fname, *p);
+ break;
+ }
+ p++;
+ }
+}
+
+/*
+ * Compile a translation set of strings into a lookup table.
+ */
+static char *
+compile_tr(char *p, struct s_tr **py)
+{
+ struct s_tr *y;
+ int i;
+ const char *op, *np;
+ char old[_POSIX2_LINE_MAX + 1];
+ char new[_POSIX2_LINE_MAX + 1];
+ size_t oclen, oldlen, nclen, newlen;
+ mbstate_t mbs1, mbs2;
+
+ if ((*py = y = malloc(sizeof(*y))) == NULL)
+ err(1, NULL);
+ y->multis = NULL;
+ y->nmultis = 0;
+
+ if (*p == '\0' || *p == '\\')
+ errx(1,
+ "%lu: %s: transform pattern can not be delimited by newline or backslash",
+ linenum, fname);
+ p = compile_delimited(p, old, 1);
+ if (p == NULL)
+ errx(1, "%lu: %s: unterminated transform source string",
+ linenum, fname);
+ p = compile_delimited(p - 1, new, 1);
+ if (p == NULL)
+ errx(1, "%lu: %s: unterminated transform target string",
+ linenum, fname);
+ EATSPACE();
+ op = old;
+ oldlen = mbsrtowcs(NULL, &op, 0, NULL);
+ if (oldlen == (size_t)-1)
+ err(1, NULL);
+ np = new;
+ newlen = mbsrtowcs(NULL, &np, 0, NULL);
+ if (newlen == (size_t)-1)
+ err(1, NULL);
+ if (newlen != oldlen)
+ errx(1, "%lu: %s: transform strings are not the same length",
+ linenum, fname);
+ if (MB_CUR_MAX == 1) {
+ /*
+ * The single-byte encoding case is easy: generate a
+ * lookup table.
+ */
+ for (i = 0; i <= UCHAR_MAX; i++)
+ y->bytetab[i] = (char)i;
+ for (; *op; op++, np++)
+ y->bytetab[(u_char)*op] = *np;
+ } else {
+ /*
+ * Multi-byte encoding case: generate a lookup table as
+ * above, but only for single-byte characters. The first
+ * bytes of multi-byte characters have their lookup table
+ * entries set to 0, which causes do_tr() to search through
+ * an auxiliary vector of multi-byte mappings.
+ */
+ memset(&mbs1, 0, sizeof(mbs1));
+ memset(&mbs2, 0, sizeof(mbs2));
+ for (i = 0; i <= UCHAR_MAX; i++)
+ y->bytetab[i] = (btowc(i) != WEOF) ? i : 0;
+ while (*op != '\0') {
+ oclen = mbrlen(op, MB_LEN_MAX, &mbs1);
+ if (oclen == (size_t)-1 || oclen == (size_t)-2)
+ errc(1, EILSEQ, NULL);
+ nclen = mbrlen(np, MB_LEN_MAX, &mbs2);
+ if (nclen == (size_t)-1 || nclen == (size_t)-2)
+ errc(1, EILSEQ, NULL);
+ if (oclen == 1 && nclen == 1)
+ y->bytetab[(u_char)*op] = *np;
+ else {
+ y->bytetab[(u_char)*op] = 0;
+ y->multis = realloc(y->multis,
+ (y->nmultis + 1) * sizeof(*y->multis));
+ if (y->multis == NULL)
+ err(1, NULL);
+ i = y->nmultis++;
+ y->multis[i].fromlen = oclen;
+ memcpy(y->multis[i].from, op, oclen);
+ y->multis[i].tolen = nclen;
+ memcpy(y->multis[i].to, np, nclen);
+ }
+ op += oclen;
+ np += nclen;
+ }
+ }
+ return (p);
+}
+
+/*
+ * Compile the text following an a or i command.
+ */
+static char *
+compile_text(void)
+{
+ int asize, esc_nl, size;
+ char *text, *p, *op, *s;
+ char lbuf[_POSIX2_LINE_MAX + 1];
+
+ asize = 2 * _POSIX2_LINE_MAX + 1;
+ if ((text = malloc(asize)) == NULL)
+ err(1, "malloc");
+ size = 0;
+ while (cu_fgets(lbuf, sizeof(lbuf), NULL)) {
+ op = s = text + size;
+ p = lbuf;
+ EATSPACE();
+ for (esc_nl = 0; *p != '\0'; p++) {
+ if (*p == '\\' && p[1] != '\0' && *++p == '\n')
+ esc_nl = 1;
+ *s++ = *p;
+ }
+ size += s - op;
+ if (!esc_nl) {
+ *s = '\0';
+ break;
+ }
+ if (asize - size < _POSIX2_LINE_MAX + 1) {
+ asize *= 2;
+ if ((text = realloc(text, asize)) == NULL)
+ err(1, "realloc");
+ }
+ }
+ text[size] = '\0';
+ if ((p = realloc(text, size + 1)) == NULL)
+ err(1, "realloc");
+ return (p);
+}
+
+/*
+ * Get an address and return a pointer to the first character after
+ * it. Fill the structure pointed to according to the address.
+ */
+static char *
+compile_addr(char *p, struct s_addr *a)
+{
+ char *end, re[_POSIX2_LINE_MAX + 1];
+ int icase;
+
+ icase = 0;
+
+ a->type = 0;
+ switch (*p) {
+ case '\\': /* Context address */
+ ++p;
+ /* FALLTHROUGH */
+ case '/': /* Context address */
+ p = compile_delimited(p, re, 0);
+ if (p == NULL)
+ errx(1, "%lu: %s: unterminated regular expression", linenum, fname);
+ /* Check for case insensitive regexp flag */
+ if (*p == 'I') {
+ icase = 1;
+ p++;
+ }
+ if (*re == '\0')
+ a->u.r = NULL;
+ else
+ a->u.r = compile_re(re, icase);
+ a->type = AT_RE;
+ return (p);
+
+ case '$': /* Last line */
+ a->type = AT_LAST;
+ return (p + 1);
+
+ case '+': /* Relative line number */
+ a->type = AT_RELLINE;
+ p++;
+ /* FALLTHROUGH */
+ /* Line number */
+ case '0': case '1': case '2': case '3': case '4':
+ case '5': case '6': case '7': case '8': case '9':
+ if (a->type == 0)
+ a->type = AT_LINE;
+ a->u.l = strtol(p, &end, 10);
+ return (end);
+ default:
+ errx(1, "%lu: %s: expected context address", linenum, fname);
+ return (NULL);
+ }
+}
+
+/*
+ * duptoeol --
+ * Return a copy of all the characters up to \n or \0.
+ */
+static char *
+duptoeol(char *s, const char *ctype)
+{
+ size_t len;
+ int ws;
+ char *p, *start;
+
+ ws = 0;
+ for (start = s; *s != '\0' && *s != '\n'; ++s)
+ ws = isspace((unsigned char)*s);
+ *s = '\0';
+ if (ws)
+ warnx("%lu: %s: whitespace after %s", linenum, fname, ctype);
+ len = s - start + 1;
+ if ((p = malloc(len)) == NULL)
+ err(1, "malloc");
+ return (memmove(p, start, len));
+}
+
+/*
+ * Convert goto label names to addresses, and count a and r commands, in
+ * the given subset of the script. Free the memory used by labels in b
+ * and t commands (but not by :).
+ *
+ * TODO: Remove } nodes
+ */
+static void
+fixuplabel(struct s_command *cp, struct s_command *end)
+{
+
+ for (; cp != end; cp = cp->next)
+ switch (cp->code) {
+ case 'a':
+ case 'r':
+ appendnum++;
+ break;
+ case 'b':
+ case 't':
+ /* Resolve branch target. */
+ if (cp->t == NULL) {
+ cp->u.c = NULL;
+ break;
+ }
+ if ((cp->u.c = findlabel(cp->t)) == NULL)
+ errx(1, "%lu: %s: undefined label '%s'", linenum, fname, cp->t);
+ free(cp->t);
+ break;
+ case '{':
+ /* Do interior commands. */
+ fixuplabel(cp->u.c, cp->next);
+ break;
+ }
+}
+
+/*
+ * Associate the given command label for later lookup.
+ */
+static void
+enterlabel(struct s_command *cp)
+{
+ struct labhash **lhp, *lh;
+ u_char *p;
+ u_int h, c;
+
+ for (h = 0, p = (u_char *)cp->t; (c = *p) != 0; p++)
+ h = (h << 5) + h + c;
+ lhp = &labels[h & LHMASK];
+ for (lh = *lhp; lh != NULL; lh = lh->lh_next)
+ if (lh->lh_hash == h && strcmp(cp->t, lh->lh_cmd->t) == 0)
+ errx(1, "%lu: %s: duplicate label '%s'", linenum, fname, cp->t);
+ if ((lh = malloc(sizeof *lh)) == NULL)
+ err(1, "malloc");
+ lh->lh_next = *lhp;
+ lh->lh_hash = h;
+ lh->lh_cmd = cp;
+ lh->lh_ref = 0;
+ *lhp = lh;
+}
+
+/*
+ * Find the label contained in the command l in the command linked
+ * list cp. L is excluded from the search. Return NULL if not found.
+ */
+static struct s_command *
+findlabel(char *name)
+{
+ struct labhash *lh;
+ u_char *p;
+ u_int h, c;
+
+ for (h = 0, p = (u_char *)name; (c = *p) != 0; p++)
+ h = (h << 5) + h + c;
+ for (lh = labels[h & LHMASK]; lh != NULL; lh = lh->lh_next) {
+ if (lh->lh_hash == h && strcmp(name, lh->lh_cmd->t) == 0) {
+ lh->lh_ref = 1;
+ return (lh->lh_cmd);
+ }
+ }
+ return (NULL);
+}
+
+/*
+ * Warn about any unused labels. As a side effect, release the label hash
+ * table space.
+ */
+static void
+uselabel(void)
+{
+ struct labhash *lh, *next;
+ int i;
+
+ for (i = 0; i < LHSZ; i++) {
+ for (lh = labels[i]; lh != NULL; lh = next) {
+ next = lh->lh_next;
+ if (!lh->lh_ref)
+ warnx("%lu: %s: unused label '%s'",
+ linenum, fname, lh->lh_cmd->t);
+ free(lh);
+ }
+ }
+}
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