/*- * Copyright (c) 1991, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Kenneth Almquist. * * 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. */ #ifndef lint /*static char sccsid[] = "from: @(#)input.c 8.1 (Berkeley) 5/31/93";*/ static char *rcsid = "$Id: input.c,v 1.11 1994/12/04 07:12:14 cgd Exp $"; #endif /* not lint */ /* * This file implements the input routines used by the parser. */ #include /* defines BUFSIZ */ #include #include #include #include "shell.h" #include "syntax.h" #include "input.h" #include "output.h" #include "options.h" #include "memalloc.h" #include "error.h" #include "alias.h" #include "parser.h" #include "extern.h" #ifndef NO_HISTORY #include "myhistedit.h" #endif #define EOF_NLEFT -99 /* value of parsenleft when EOF pushed back */ MKINIT struct strpush { struct strpush *prev; /* preceding string on stack */ char *prevstring; int prevnleft; struct alias *ap; /* if push was associated with an alias */ }; /* * The parsefile structure pointed to by the global variable parsefile * contains information about the current file being read. */ MKINIT struct parsefile { struct parsefile *prev; /* preceding file on stack */ int linno; /* current line */ int fd; /* file descriptor (or -1 if string) */ int nleft; /* number of chars left in buffer */ char *nextc; /* next char in buffer */ char *buf; /* input buffer */ struct strpush *strpush; /* for pushing strings at this level */ struct strpush basestrpush; /* so pushing one is fast */ }; int plinno = 1; /* input line number */ MKINIT int parsenleft; /* copy of parsefile->nleft */ char *parsenextc; /* copy of parsefile->nextc */ MKINIT struct parsefile basepf; /* top level input file */ char basebuf[BUFSIZ]; /* buffer for top level input file */ struct parsefile *parsefile = &basepf; /* current input file */ char *pushedstring; /* copy of parsenextc when text pushed back */ int pushednleft; /* copy of parsenleft when text pushed back */ int init_editline = 0; /* editline library initialized? */ int whichprompt; /* 1 == PS1, 2 == PS2 */ #ifndef NO_HISTORY EditLine *el; /* cookie for editline package */ #endif #ifdef __STDC__ STATIC void pushfile(void); #else STATIC void pushfile(); #endif void popstring(); #ifdef mkinit INCLUDE "input.h" INCLUDE "error.h" INIT { extern char basebuf[]; basepf.nextc = basepf.buf = basebuf; } RESET { if (exception != EXSHELLPROC) parsenleft = 0; /* clear input buffer */ popallfiles(); } SHELLPROC { popallfiles(); } #endif /* * Read a line from the script. */ char * pfgets(line, len) char *line; int len; { register char *p = line; int nleft = len; int c; while (--nleft > 0) { c = pgetc_macro(); if (c == PEOF) { if (p == line) return NULL; break; } *p++ = c; if (c == '\n') break; } *p = '\0'; return line; } /* * Read a character from the script, returning PEOF on end of file. * Nul characters in the input are silently discarded. */ int pgetc() { return pgetc_macro(); } /* * Refill the input buffer and return the next input character: * * 1) If a string was pushed back on the input, pop it; * 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading * from a string so we can't refill the buffer, return EOF. * 3) Call read to read in the characters. * 4) Delete all nul characters from the buffer. */ int preadbuffer() { register char *p, *q; register int i; register int something; #ifndef NO_HISTORY extern EditLine *el; #endif if (parsefile->strpush) { popstring(); if (--parsenleft >= 0) return (*parsenextc++); } if (parsenleft == EOF_NLEFT || parsefile->buf == NULL) return PEOF; flushout(&output); flushout(&errout); retry: p = parsenextc = parsefile->buf; #ifndef NO_HISTORY if (parsefile->fd == 0 && el) { const char *rl_cp; int len; rl_cp = el_gets(el, &len); if (rl_cp == NULL) { i = 0; goto eof; } strcpy(p, rl_cp); /* XXX - BUFSIZE should redesign so not necessary */ i = len; } else { #endif regular_read: i = read(parsefile->fd, p, BUFSIZ - 1); #ifndef NO_HISTORY } #endif eof: if (i <= 0) { if (i < 0) { if (errno == EINTR) goto retry; if (parsefile->fd == 0 && errno == EWOULDBLOCK) { int flags = fcntl(0, F_GETFL, 0); if (flags >= 0 && flags & O_NONBLOCK) { flags &=~ O_NONBLOCK; if (fcntl(0, F_SETFL, flags) >= 0) { out2str("sh: turning off NDELAY mode\n"); goto retry; } } } } parsenleft = EOF_NLEFT; return PEOF; } parsenleft = i - 1; /* we're returning one char in this call */ /* delete nul characters */ something = 0; for (;;) { if (*p == '\0') break; if (*p != ' ' && *p != '\t' && *p != '\n') something = 1; p++; if (--i <= 0) { *p = '\0'; goto done; /* no nul characters */ } } /* * remove nuls */ q = p++; while (--i > 0) { if (*p != '\0') *q++ = *p; p++; } *q = '\0'; if (q == parsefile->buf) goto retry; /* buffer contained nothing but nuls */ parsenleft = q - parsefile->buf - 1; done: #ifndef NO_HISTORY if (parsefile->fd == 0 && hist && something) { INTOFF; history(hist, whichprompt == 1 ? H_ENTER : H_ADD, parsefile->buf); INTON; } #endif if (vflag) { /* * This isn't right. Most shells coordinate it with * reading a line at a time. I honestly don't know if its * worth it. */ i = parsenleft + 1; p = parsefile->buf; for (; i--; p++) out2c(*p) flushout(out2); } return *parsenextc++; } /* * Undo the last call to pgetc. Only one character may be pushed back. * PEOF may be pushed back. */ void pungetc() { parsenleft++; parsenextc--; } /* * Push a string back onto the input at this current parsefile level. * We handle aliases this way. */ void pushstring(s, len, ap) char *s; int len; void *ap; { struct strpush *sp; INTOFF; /*dprintf("*** calling pushstring: %s, %d\n", s, len);*/ if (parsefile->strpush) { sp = ckmalloc(sizeof (struct strpush)); sp->prev = parsefile->strpush; parsefile->strpush = sp; } else sp = parsefile->strpush = &(parsefile->basestrpush); sp->prevstring = parsenextc; sp->prevnleft = parsenleft; sp->ap = (struct alias *)ap; if (ap) ((struct alias *)ap)->flag |= ALIASINUSE; parsenextc = s; parsenleft = len; INTON; } void popstring() { struct strpush *sp = parsefile->strpush; INTOFF; parsenextc = sp->prevstring; parsenleft = sp->prevnleft; /*dprintf("*** calling popstring: restoring to '%s'\n", parsenextc);*/ if (sp->ap) sp->ap->flag &= ~ALIASINUSE; parsefile->strpush = sp->prev; if (sp != &(parsefile->basestrpush)) ckfree(sp); INTON; } /* * Set the input to take input from a file. If push is set, push the * old input onto the stack first. */ void setinputfile(fname, push) char *fname; int push; { int fd; int fd2; INTOFF; if ((fd = open(fname, O_RDONLY)) < 0) error("Can't open %s", fname); if (fd < 10) { fd2 = copyfd(fd, 10); close(fd); if (fd2 < 0) error("Out of file descriptors"); fd = fd2; } setinputfd(fd, push); INTON; } /* * Like setinputfile, but takes an open file descriptor. Call this with * interrupts off. */ void setinputfd(fd, push) int fd; int push; { if (push) { pushfile(); parsefile->buf = ckmalloc(BUFSIZ); } if (parsefile->fd > 0) close(parsefile->fd); parsefile->fd = fd; if (parsefile->buf == NULL) parsefile->buf = ckmalloc(BUFSIZ); parsenleft = 0; plinno = 1; } /* * Like setinputfile, but takes input from a string. */ void setinputstring(string, push) char *string; int push; { INTOFF; if (push) pushfile(); parsenextc = string; parsenleft = strlen(string); parsefile->buf = NULL; plinno = 1; INTON; } /* * To handle the "." command, a stack of input files is used. Pushfile * adds a new entry to the stack and popfile restores the previous level. */ STATIC void pushfile() { struct parsefile *pf; parsefile->nleft = parsenleft; parsefile->nextc = parsenextc; parsefile->linno = plinno; pf = (struct parsefile *)ckmalloc(sizeof (struct parsefile)); pf->prev = parsefile; pf->fd = -1; pf->strpush = NULL; pf->basestrpush.prev = NULL; parsefile = pf; } void popfile() { struct parsefile *pf = parsefile; INTOFF; if (pf->fd >= 0) close(pf->fd); if (pf->buf) ckfree(pf->buf); while (pf->strpush) popstring(); parsefile = pf->prev; ckfree(pf); parsenleft = parsefile->nleft; parsenextc = parsefile->nextc; plinno = parsefile->linno; INTON; } /* * Return to top level. */ void popallfiles() { while (parsefile != &basepf) popfile(); } /* * Close the file(s) that the shell is reading commands from. Called * after a fork is done. */ void closescript() { popallfiles(); if (parsefile->fd > 0) { close(parsefile->fd); parsefile->fd = 0; } }