/* $NetBSD: process.c,v 1.30 2001/10/02 03:03:02 atatat Exp $ */ /*- * Copyright (c) 1992 Diomidis Spinellis. * Copyright (c) 1992, 1993, 1994 * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 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 #ifndef lint #if 0 static char sccsid[] = "@(#)process.c 8.6 (Berkeley) 4/20/94"; #else __RCSID("$NetBSD: process.c,v 1.30 2001/10/02 03:03:02 atatat Exp $"); #endif #endif /* not lint */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "defs.h" #include "extern.h" static SPACE HS, PS, SS; #define pd PS.deleted #define ps PS.space #define psl PS.len #define hs HS.space #define hsl HS.len static inline int applies __P((struct s_command *)); static void flush_appends __P((void)); static void lputs __P((char *)); static inline int regexec_e __P((regex_t *, const char *, int, int, size_t)); static void regsub __P((SPACE *, char *, char *)); static int substitute __P((struct s_command *)); struct s_appends *appends; /* Array of pointers to strings to append. */ static int appendx; /* Index into appends array. */ int appendnum; /* Size of appends array. */ static int lastaddr; /* Set by applies if last address of a range. */ static int sdone; /* If any substitutes since last line input. */ /* Iov structure for 'w' commands. */ static regex_t *defpreg; size_t maxnsub; regmatch_t *match; #define OUT(s) { fwrite(s, sizeof(u_char), psl, stdout); } void process() { struct s_command *cp; SPACE tspace; size_t len, oldpsl; char *p; oldpsl = 0; for (linenum = 0; mf_fgets(&PS, REPLACE);) { pd = 0; top: cp = prog; redirect: while (cp != NULL) { if (!applies(cp)) { cp = cp->next; continue; } switch (cp->code) { case '{': cp = cp->u.c; goto redirect; case 'a': if (appendx >= appendnum) appends = xrealloc(appends, sizeof(struct s_appends) * (appendnum *= 2)); appends[appendx].type = AP_STRING; appends[appendx].s = cp->t; appends[appendx].len = strlen(cp->t); appendx++; break; case 'b': cp = cp->u.c; goto redirect; case 'c': pd = 1; psl = 0; if (cp->a2 == NULL || lastaddr) (void)printf("%s", cp->t); break; case 'd': pd = 1; goto new; case 'D': if (psl == 0) pd = 1; if (pd) goto new; if ((p = memchr(ps, '\n', psl - 1)) == NULL) { pd = 1; goto new; } else { psl -= (p + 1) - ps; memmove(ps, p + 1, psl); goto top; } case 'g': cspace(&PS, hs, hsl, REPLACE); break; case 'G': if (hs == NULL) cspace(&HS, "\n", 1, REPLACE); cspace(&PS, hs, hsl, 0); break; case 'h': cspace(&HS, ps, psl, REPLACE); break; case 'H': cspace(&HS, ps, psl, 0); break; case 'i': (void)printf("%s", cp->t); break; case 'l': lputs(ps); break; case 'n': if (!nflag && !pd) OUT(ps) flush_appends(); if (!mf_fgets(&PS, REPLACE)) exit(0); pd = 0; break; case 'N': flush_appends(); if (!mf_fgets(&PS, 0)) { if (!nflag && !pd) OUT(ps) exit(0); } break; case 'p': if (pd) break; OUT(ps) break; case 'P': if (pd) break; if ((p = memchr(ps, '\n', psl - 1)) != NULL) { oldpsl = psl; psl = (p + 1) - ps; } OUT(ps) if (p != NULL) psl = oldpsl; break; case 'q': if (!nflag && !pd) OUT(ps) flush_appends(); exit(0); case 'r': if (appendx >= appendnum) appends = xrealloc(appends, sizeof(struct s_appends) * (appendnum *= 2)); appends[appendx].type = AP_FILE; appends[appendx].s = cp->t; appends[appendx].len = strlen(cp->t); appendx++; break; case 's': sdone |= substitute(cp); break; case 't': if (sdone) { sdone = 0; cp = cp->u.c; goto redirect; } break; case 'w': if (pd) break; if (cp->u.fd == -1 && (cp->u.fd = open(cp->t, O_WRONLY|O_APPEND|O_CREAT|O_TRUNC, DEFFILEMODE)) == -1) err(FATAL, "%s: %s\n", cp->t, strerror(errno)); if (write(cp->u.fd, ps, psl) != psl) err(FATAL, "%s: %s\n", cp->t, strerror(errno)); break; case 'x': if (hs == NULL) cspace(&HS, "\n", 1, REPLACE); tspace = PS; PS = HS; HS = tspace; break; case 'y': if (pd) break; for (p = ps, len = psl; --len; ++p) *p = cp->u.y[(int)*p]; break; case ':': case '}': break; case '=': (void)printf("%lu\n", linenum); } cp = cp->next; } /* for all cp */ new: if (!nflag && !pd) OUT(ps) flush_appends(); } /* for all lines */ } /* * TRUE if the address passed matches the current program state * (lastline, linenumber, ps). */ #define MATCH(a) \ (a)->type == AT_RE ? regexec_e((a)->u.r, ps, 0, 1, psl) : \ (a)->type == AT_LINE ? linenum == (a)->u.l : lastline /* * Return TRUE if the command applies to the current line. Sets the inrange * flag to process ranges. Interprets the non-select (``!'') flag. */ static inline int applies(cp) struct s_command *cp; { int r; lastaddr = 0; if (cp->a1 == NULL && cp->a2 == NULL) r = 1; else if (cp->a2) { if (cp->inrange) { if (MATCH(cp->a2)) { cp->inrange = 0; lastaddr = 1; } r = 1; } else if (MATCH(cp->a1)) { /* * If the second address is a number less than or * equal to the line number first selected, only * one line shall be selected. * -- POSIX 1003.2 */ if (cp->a2->type == AT_LINE && linenum >= cp->a2->u.l) lastaddr = 1; else cp->inrange = 1; r = 1; } else r = 0; } else r = MATCH(cp->a1); return (cp->nonsel ? ! r : r); } /* * substitute -- * Do substitutions in the pattern space. Currently, we build a * copy of the new pattern space in the substitute space structure * and then swap them. */ static int substitute(cp) struct s_command *cp; { SPACE tspace; regex_t *re; size_t re_off, slen; int lastempty, n; char *s; s = ps; re = cp->u.s->re; if (re == NULL) { if (defpreg != NULL && cp->u.s->maxbref > defpreg->re_nsub) { linenum = cp->u.s->linenum; err(COMPILE, "\\%d not defined in the RE", cp->u.s->maxbref); } } if (!regexec_e(re, s, 0, 0, psl)) return (0); SS.len = 0; /* Clean substitute space. */ slen = psl; n = cp->u.s->n; lastempty = 1; switch (n) { case 0: /* Global */ do { if (lastempty || match[0].rm_so != match[0].rm_eo) { /* Locate start of replaced string. */ re_off = match[0].rm_so; /* Copy leading retained string. */ cspace(&SS, s, re_off, APPEND); /* Add in regular expression. */ regsub(&SS, s, cp->u.s->new); } /* Move past this match. */ if (match[0].rm_so != match[0].rm_eo) { s += match[0].rm_eo; slen -= match[0].rm_eo; lastempty = 0; } else { if (match[0].rm_so == 0) cspace(&SS, s, match[0].rm_so + 1, APPEND); else cspace(&SS, s + match[0].rm_so, 1, APPEND); s += match[0].rm_so + 1; slen -= match[0].rm_so + 1; lastempty = 1; } } while (slen > 0 && regexec_e(re, s, REG_NOTBOL, 0, slen)); /* Copy trailing retained string. */ if (slen > 0) cspace(&SS, s, slen, APPEND); break; default: /* Nth occurrence */ while (--n) { s += match[0].rm_eo; slen -= match[0].rm_eo; if (!regexec_e(re, s, REG_NOTBOL, 0, slen)) return (0); } /* FALLTHROUGH */ case 1: /* 1st occurrence */ /* Locate start of replaced string. */ re_off = match[0].rm_so + (s - ps); /* Copy leading retained string. */ cspace(&SS, ps, re_off, APPEND); /* Add in regular expression. */ regsub(&SS, s, cp->u.s->new); /* Copy trailing retained string. */ s += match[0].rm_eo; slen -= match[0].rm_eo; cspace(&SS, s, slen, APPEND); break; } /* * Swap the substitute space and the pattern space, and make sure * that any leftover pointers into stdio memory get lost. */ tspace = PS; PS = SS; SS = tspace; SS.space = SS.back; /* Handle the 'p' flag. */ if (cp->u.s->p) OUT(ps) /* Handle the 'w' flag. */ if (cp->u.s->wfile && !pd) { if (cp->u.s->wfd == -1 && (cp->u.s->wfd = open(cp->u.s->wfile, O_WRONLY|O_APPEND|O_CREAT|O_TRUNC, DEFFILEMODE)) == -1) err(FATAL, "%s: %s\n", cp->u.s->wfile, strerror(errno)); if (write(cp->u.s->wfd, ps, psl) != psl) err(FATAL, "%s: %s\n", cp->u.s->wfile, strerror(errno)); } return (1); } /* * Flush append requests. Always called before reading a line, * therefore it also resets the substitution done (sdone) flag. */ static void flush_appends() { FILE *f; int count, i; char buf[8 * 1024]; for (i = 0; i < appendx; i++) switch (appends[i].type) { case AP_STRING: fwrite(appends[i].s, sizeof(char), appends[i].len, stdout); break; case AP_FILE: /* * Read files probably shouldn't be cached. Since * it's not an error to read a non-existent file, * it's possible that another program is interacting * with the sed script through the file system. It * would be truly bizarre, but possible. It's probably * not that big a performance win, anyhow. */ if ((f = fopen(appends[i].s, "r")) == NULL) break; while ((count = fread(buf, sizeof(char), sizeof(buf), f)) > 0) (void)fwrite(buf, sizeof(char), count, stdout); (void)fclose(f); break; } if (ferror(stdout)) err(FATAL, "stdout: %s", strerror(errno ? errno : EIO)); appendx = sdone = 0; } static void lputs(s) char *s; { int count; char *escapes, *p; struct winsize win; static int termwidth = -1; if (termwidth == -1) { if ((p = getenv("COLUMNS")) != NULL) termwidth = atoi(p); else if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) == 0 && win.ws_col > 0) termwidth = win.ws_col; else termwidth = 60; } for (count = 0; *s; ++s) { if (count >= termwidth) { (void)printf("\\\n"); count = 0; } if (isascii((unsigned char)*s) && isprint((unsigned char)*s) && *s != '\\') { (void)putchar(*s); count++; } else { escapes = "\\\a\b\f\n\r\t\v"; (void)putchar('\\'); if ((p = strchr(escapes, *s)) != NULL) { (void)putchar("\\abfnrtv"[p - escapes]); count += 2; } else { (void)printf("%03o", *(u_char *)s); count += 4; } } } (void)putchar('$'); (void)putchar('\n'); if (ferror(stdout)) err(FATAL, "stdout: %s", strerror(errno ? errno : EIO)); } static inline int regexec_e(preg, string, eflags, nomatch, slen) regex_t *preg; const char *string; int eflags, nomatch; size_t slen; { int eval; #ifndef REG_STARTEND char *buf; #endif if (preg == NULL) { if (defpreg == NULL) err(FATAL, "first RE may not be empty"); } else defpreg = preg; /* Set anchors, discounting trailing newline (if any). */ if (slen > 0 && string[slen - 1] == '\n') slen--; #ifndef REG_STARTEND if ((buf = malloc(slen + 1)) == NULL) err(1, NULL); (void)memcpy(buf, string, slen); buf[slen] = '\0'; eval = regexec(defpreg, buf, nomatch ? 0 : maxnsub + 1, match, eflags); free(buf); #else match[0].rm_so = 0; match[0].rm_eo = slen; eval = regexec(defpreg, string, nomatch ? 0 : maxnsub + 1, match, eflags | REG_STARTEND); #endif switch(eval) { case 0: return (1); case REG_NOMATCH: return (0); } err(FATAL, "RE error: %s", strregerror(eval, defpreg)); /* NOTREACHED */ return (0); } /* * regsub - perform substitutions after a regexp match * Based on a routine by Henry Spencer */ static void regsub(sp, string, src) SPACE *sp; char *string, *src; { int len, no; char c, *dst; #define NEEDSP(reqlen) \ if (sp->len >= sp->blen - (reqlen) - 1) { \ sp->blen += (reqlen) + 1024; \ sp->space = sp->back = xrealloc(sp->back, sp->blen); \ dst = sp->space + sp->len; \ } dst = sp->space + sp->len; while ((c = *src++) != '\0') { if (c == '&') no = 0; else if (c == '\\' && isdigit((unsigned char)*src)) no = *src++ - '0'; else no = -1; if (no < 0) { /* Ordinary character. */ if (c == '\\' && (*src == '\\' || *src == '&')) c = *src++; NEEDSP(1); *dst++ = c; ++sp->len; } else if (match[no].rm_so != -1 && match[no].rm_eo != -1) { len = match[no].rm_eo - match[no].rm_so; NEEDSP(len); memmove(dst, string + match[no].rm_so, len); dst += len; sp->len += len; } } NEEDSP(1); *dst = '\0'; } /* * aspace -- * Append the source space to the destination space, allocating new * space as necessary. */ void cspace(sp, p, len, spflag) SPACE *sp; char *p; size_t len; enum e_spflag spflag; { size_t tlen; /* Make sure SPACE has enough memory and ramp up quickly. */ tlen = sp->len + len + 1; if (tlen > sp->blen) { sp->blen = tlen + 1024; sp->space = sp->back = xrealloc(sp->back, sp->blen); } if (spflag == REPLACE) sp->len = 0; memmove(sp->space + sp->len, p, len); sp->space[sp->len += len] = '\0'; } /* * Close all cached opened files and report any errors */ void cfclose(cp, end) struct s_command *cp, *end; { for (; cp != end; cp = cp->next) switch(cp->code) { case 's': if (cp->u.s->wfd != -1 && close(cp->u.s->wfd)) err(FATAL, "%s: %s", cp->u.s->wfile, strerror(errno)); cp->u.s->wfd = -1; break; case 'w': if (cp->u.fd != -1 && close(cp->u.fd)) err(FATAL, "%s: %s", cp->t, strerror(errno)); cp->u.fd = -1; break; case '{': cfclose(cp->u.c, cp->next); break; } }