diff options
Diffstat (limited to 'bin/cash/input.c')
| -rw-r--r-- | bin/cash/input.c | 520 |
1 files changed, 0 insertions, 520 deletions
diff --git a/bin/cash/input.c b/bin/cash/input.c deleted file mode 100644 index 24ba73b5..00000000 --- a/bin/cash/input.c +++ /dev/null @@ -1,520 +0,0 @@ -/*- - * 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. 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 -#if 0 -static char sccsid[] = "@(#)input.c 8.3 (Berkeley) 6/9/95"; -#endif -#endif /* not lint */ -#include <sys/cdefs.h> -__FBSDID("$FreeBSD: releng/12.0/bin/sh/input.c 314436 2017-02-28 23:42:47Z imp $"); - -#include <stdio.h> /* defines BUFSIZ */ -#include <fcntl.h> -#include <errno.h> -#include <unistd.h> -#include <stdlib.h> -#include <string.h> - -/* - * This file implements the input routines used by the parser. - */ - -#include "shell.h" -#include "redir.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 "myhistedit.h" -#include "trap.h" - -#define EOF_NLEFT -99 /* value of parsenleft when EOF pushed back */ - -struct strpush { - struct strpush *prev; /* preceding string on stack */ - const char *prevstring; - int prevnleft; - int prevlleft; - 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. - */ - -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 this line */ - int lleft; /* number of lines left in this buffer */ - const 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 */ -int parsenleft; /* copy of parsefile->nleft */ -static int parselleft; /* copy of parsefile->lleft */ -const char *parsenextc; /* copy of parsefile->nextc */ -static char basebuf[BUFSIZ + 1];/* buffer for top level input file */ -static struct parsefile basepf = { /* top level input file */ - .nextc = basebuf, - .buf = basebuf -}; -static struct parsefile *parsefile = &basepf; /* current input file */ -int whichprompt; /* 1 == PS1, 2 == PS2 */ - -EditLine *el; /* cookie for editline package */ - -static void pushfile(void); -static int preadfd(void); -static void popstring(void); - -void -resetinput(void) -{ - popallfiles(); - parselleft = parsenleft = 0; /* clear input buffer */ -} - - - -/* - * Read a character from the script, returning PEOF on end of file. - * Nul characters in the input are silently discarded. - */ - -int -pgetc(void) -{ - return pgetc_macro(); -} - - -static int -preadfd(void) -{ - int nr; - parsenextc = parsefile->buf; - -retry: -#ifndef NO_HISTORY - if (parsefile->fd == 0 && el) { - static const char *rl_cp; - static int el_len; - - if (rl_cp == NULL) { - el_resize(el); - rl_cp = el_gets(el, &el_len); - } - if (rl_cp == NULL) - nr = el_len == 0 ? 0 : -1; - else { - nr = el_len; - if (nr > BUFSIZ) - nr = BUFSIZ; - memcpy(parsefile->buf, rl_cp, nr); - if (nr != el_len) { - el_len -= nr; - rl_cp += nr; - } else - rl_cp = NULL; - } - } else -#endif - nr = read(parsefile->fd, parsefile->buf, BUFSIZ); - - if (nr <= 0) { - if (nr < 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) { - out2fmt_flush("sh: turning off NDELAY mode\n"); - goto retry; - } - } - } - } - nr = -1; - } - return nr; -} - -/* - * 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) If there is more in this buffer, use it else call read to fill it. - * 4) Process input up to the next newline, deleting nul characters. - */ - -int -preadbuffer(void) -{ - char *p, *q, *r, *end; - char savec; - - while (parsefile->strpush) { - /* - * Add a space to the end of an alias to ensure that the - * alias remains in use while parsing its last word. - * This avoids alias recursions. - */ - if (parsenleft == -1 && parsefile->strpush->ap != NULL) - return ' '; - popstring(); - if (--parsenleft >= 0) - return (*parsenextc++); - } - if (parsenleft == EOF_NLEFT || parsefile->buf == NULL) - return PEOF; - -again: - if (parselleft <= 0) { - if ((parselleft = preadfd()) == -1) { - parselleft = parsenleft = EOF_NLEFT; - return PEOF; - } - } - - p = parsefile->buf + (parsenextc - parsefile->buf); - end = p + parselleft; - *end = '\0'; - q = strchr(p, '\n'); - if (!q) q = strchr(p, '\0'); - if (q != end && *q == '\0') { - /* delete nul characters */ - for (r = q; q != end; q++) { - if (*q != '\0') - *r++ = *q; - } - parselleft -= end - r; - if (parselleft == 0) - goto again; - end = p + parselleft; - *end = '\0'; - q = strchr(p, '\n'); - if (!q) q = strchr(p, '\0'); - } - if (q == end) { - parsenleft = parselleft; - parselleft = 0; - } else /* *q == '\n' */ { - q++; - parsenleft = q - parsenextc; - parselleft -= parsenleft; - } - parsenleft--; - - savec = *q; - *q = '\0'; - -#ifndef NO_HISTORY - if (parsefile->fd == 0 && hist && - parsenextc[strspn(parsenextc, " \t\n")] != '\0') { - HistEvent he; - INTOFF; - history(hist, &he, whichprompt == 1 ? H_ENTER : H_ADD, - parsenextc); - INTON; - } -#endif - - if (vflag) { - out2str(parsenextc); - flushout(out2); - } - - *q = savec; - - return *parsenextc++; -} - -/* - * Returns if we are certain we are at EOF. Does not cause any more input - * to be read from the outside world. - */ - -int -preadateof(void) -{ - if (parsenleft > 0) - return 0; - if (parsefile->strpush) - return 0; - if (parsenleft == EOF_NLEFT || parsefile->buf == NULL) - return 1; - return 0; -} - -/* - * Undo the last call to pgetc. Only one character may be pushed back. - * PEOF may be pushed back. - */ - -void -pungetc(void) -{ - parsenleft++; - parsenextc--; -} - -/* - * Push a string back onto the input at this current parsefile level. - * We handle aliases this way. - */ -void -pushstring(const char *s, int len, struct alias *ap) -{ - struct strpush *sp; - - INTOFF; -/*out2fmt_flush("*** 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->prevlleft = parselleft; - sp->ap = ap; - if (ap) - ap->flag |= ALIASINUSE; - parsenextc = s; - parsenleft = len; - INTON; -} - -static void -popstring(void) -{ - struct strpush *sp = parsefile->strpush; - - INTOFF; - if (sp->ap) { - if (parsenextc != sp->ap->val && - (parsenextc[-1] == ' ' || parsenextc[-1] == '\t')) - forcealias(); - sp->ap->flag &= ~ALIASINUSE; - } - parsenextc = sp->prevstring; - parsenleft = sp->prevnleft; - parselleft = sp->prevlleft; -/*out2fmt_flush("*** calling popstring: restoring to '%s'\n", parsenextc);*/ - 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(const char *fname, int push) -{ - int fd; - int fd2; - - INTOFF; - if ((fd = open(fname, O_RDONLY | O_CLOEXEC)) < 0) - error("cannot open %s: %s", fname, strerror(errno)); - if (fd < 10) { - fd2 = fcntl(fd, F_DUPFD_CLOEXEC, 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 (which should have - * its FD_CLOEXEC flag already set). Call this with interrupts off. - */ - -void -setinputfd(int fd, int push) -{ - if (push) { - pushfile(); - parsefile->buf = ckmalloc(BUFSIZ + 1); - } - if (parsefile->fd > 0) - close(parsefile->fd); - parsefile->fd = fd; - if (parsefile->buf == NULL) - parsefile->buf = ckmalloc(BUFSIZ + 1); - parselleft = parsenleft = 0; - plinno = 1; -} - - -/* - * Like setinputfile, but takes input from a string. - */ - -void -setinputstring(const char *string, int push) -{ - INTOFF; - if (push) - pushfile(); - parsenextc = string; - parselleft = 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(void) -{ - struct parsefile *pf; - - parsefile->nleft = parsenleft; - parsefile->lleft = parselleft; - 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(void) -{ - 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; - parselleft = parsefile->lleft; - parsenextc = parsefile->nextc; - plinno = parsefile->linno; - INTON; -} - - -/* - * Return current file (to go back to it later using popfilesupto()). - */ - -struct parsefile * -getcurrentfile(void) -{ - return parsefile; -} - - -/* - * Pop files until the given file is on top again. Useful for regular - * builtins that read shell commands from files or strings. - * If the given file is not an active file, an error is raised. - */ - -void -popfilesupto(struct parsefile *file) -{ - while (parsefile != file && parsefile != &basepf) - popfile(); - if (parsefile != file) - error("popfilesupto() misused"); -} - -/* - * Return to top level. - */ - -void -popallfiles(void) -{ - while (parsefile != &basepf) - popfile(); -} - - - -/* - * Close the file(s) that the shell is reading commands from. Called - * after a fork is done. - */ - -void -closescript(void) -{ - popallfiles(); - if (parsefile->fd > 0) { - close(parsefile->fd); - parsefile->fd = 0; - } -} |