11556Srgrimes/*- 21556Srgrimes * Copyright (c) 1991, 1993 31556Srgrimes * The Regents of the University of California. All rights reserved. 41556Srgrimes * 51556Srgrimes * This code is derived from software contributed to Berkeley by 61556Srgrimes * Kenneth Almquist. 71556Srgrimes * 81556Srgrimes * Redistribution and use in source and binary forms, with or without 91556Srgrimes * modification, are permitted provided that the following conditions 101556Srgrimes * are met: 111556Srgrimes * 1. Redistributions of source code must retain the above copyright 121556Srgrimes * notice, this list of conditions and the following disclaimer. 131556Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141556Srgrimes * notice, this list of conditions and the following disclaimer in the 151556Srgrimes * documentation and/or other materials provided with the distribution. 161556Srgrimes * 4. Neither the name of the University nor the names of its contributors 171556Srgrimes * may be used to endorse or promote products derived from this software 181556Srgrimes * without specific prior written permission. 191556Srgrimes * 201556Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 211556Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 221556Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 231556Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 241556Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 251556Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 261556Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 271556Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 281556Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 291556Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 301556Srgrimes * SUCH DAMAGE. 311556Srgrimes */ 321556Srgrimes 331556Srgrimes#ifndef lint 3436150Scharnier#if 0 3536150Scharnierstatic char sccsid[] = "@(#)input.c 8.3 (Berkeley) 6/9/95"; 3636150Scharnier#endif 371556Srgrimes#endif /* not lint */ 3899110Sobrien#include <sys/cdefs.h> 3999110Sobrien__FBSDID("$FreeBSD$"); 401556Srgrimes 4117987Speter#include <stdio.h> /* defines BUFSIZ */ 4217987Speter#include <fcntl.h> 4317987Speter#include <errno.h> 4417987Speter#include <unistd.h> 4517987Speter#include <stdlib.h> 4617987Speter#include <string.h> 4717987Speter 481556Srgrimes/* 491556Srgrimes * This file implements the input routines used by the parser. 501556Srgrimes */ 511556Srgrimes 521556Srgrimes#include "shell.h" 5317987Speter#include "redir.h" 541556Srgrimes#include "syntax.h" 551556Srgrimes#include "input.h" 561556Srgrimes#include "output.h" 571556Srgrimes#include "options.h" 581556Srgrimes#include "memalloc.h" 591556Srgrimes#include "error.h" 601556Srgrimes#include "alias.h" 611556Srgrimes#include "parser.h" 621556Srgrimes#include "myhistedit.h" 63100588Stjr#include "trap.h" 641556Srgrimes 651556Srgrimes#define EOF_NLEFT -99 /* value of parsenleft when EOF pushed back */ 661556Srgrimes 671556Srgrimesstruct strpush { 681556Srgrimes struct strpush *prev; /* preceding string on stack */ 69248980Sjilles const char *prevstring; 701556Srgrimes int prevnleft; 7112043Speter int prevlleft; 721556Srgrimes struct alias *ap; /* if push was associated with an alias */ 731556Srgrimes}; 741556Srgrimes 751556Srgrimes/* 761556Srgrimes * The parsefile structure pointed to by the global variable parsefile 771556Srgrimes * contains information about the current file being read. 781556Srgrimes */ 791556Srgrimes 801556Srgrimesstruct parsefile { 811556Srgrimes struct parsefile *prev; /* preceding file on stack */ 821556Srgrimes int linno; /* current line */ 831556Srgrimes int fd; /* file descriptor (or -1 if string) */ 8420425Ssteve int nleft; /* number of chars left in this line */ 8520425Ssteve int lleft; /* number of lines left in this buffer */ 86248980Sjilles const char *nextc; /* next char in buffer */ 871556Srgrimes char *buf; /* input buffer */ 881556Srgrimes struct strpush *strpush; /* for pushing strings at this level */ 891556Srgrimes struct strpush basestrpush; /* so pushing one is fast */ 901556Srgrimes}; 911556Srgrimes 921556Srgrimes 931556Srgrimesint plinno = 1; /* input line number */ 94201053Sjillesint parsenleft; /* copy of parsefile->nleft */ 95253658Sjillesstatic int parselleft; /* copy of parsefile->lleft */ 96248980Sjillesconst char *parsenextc; /* copy of parsefile->nextc */ 97245676Sjillesstatic char basebuf[BUFSIZ + 1];/* buffer for top level input file */ 98245676Sjillesstatic struct parsefile basepf = { /* top level input file */ 99245676Sjilles .nextc = basebuf, 100245676Sjilles .buf = basebuf 101245676Sjilles}; 102213760Sobrienstatic struct parsefile *parsefile = &basepf; /* current input file */ 1031556Srgrimesint whichprompt; /* 1 == PS1, 2 == PS2 */ 1041556Srgrimes 1051556SrgrimesEditLine *el; /* cookie for editline package */ 1061556Srgrimes 107213811Sobrienstatic void pushfile(void); 108213811Sobrienstatic int preadfd(void); 109229220Sjillesstatic void popstring(void); 1101556Srgrimes 111253650Sjillesvoid 112253650Sjillesresetinput(void) 113253650Sjilles{ 114194406Sjilles popallfiles(); 115218306Sjilles parselleft = parsenleft = 0; /* clear input buffer */ 1161556Srgrimes} 1171556Srgrimes 1181556Srgrimes 1191556Srgrimes/* 1201556Srgrimes * Read a line from the script. 1211556Srgrimes */ 1221556Srgrimes 1231556Srgrimeschar * 12490111Simppfgets(char *line, int len) 12517987Speter{ 12625225Ssteve char *p = line; 1271556Srgrimes int nleft = len; 1281556Srgrimes int c; 1291556Srgrimes 1301556Srgrimes while (--nleft > 0) { 1311556Srgrimes c = pgetc_macro(); 1321556Srgrimes if (c == PEOF) { 1331556Srgrimes if (p == line) 1341556Srgrimes return NULL; 1351556Srgrimes break; 1361556Srgrimes } 1371556Srgrimes *p++ = c; 1381556Srgrimes if (c == '\n') 1391556Srgrimes break; 1401556Srgrimes } 1411556Srgrimes *p = '\0'; 1421556Srgrimes return line; 1431556Srgrimes} 1441556Srgrimes 1451556Srgrimes 1461556Srgrimes 1471556Srgrimes/* 1481556Srgrimes * Read a character from the script, returning PEOF on end of file. 1491556Srgrimes * Nul characters in the input are silently discarded. 1501556Srgrimes */ 1511556Srgrimes 1521556Srgrimesint 15390111Simppgetc(void) 15420425Ssteve{ 1551556Srgrimes return pgetc_macro(); 1561556Srgrimes} 1571556Srgrimes 15820425Ssteve 159213811Sobrienstatic int 16090111Simppreadfd(void) 16112043Speter{ 16212043Speter int nr; 16320425Ssteve parsenextc = parsefile->buf; 1641556Srgrimes 165100588Stjr#ifndef NO_HISTORY 166100588Stjr if (el != NULL && gotwinch) { 167100588Stjr gotwinch = 0; 168100588Stjr el_resize(el); 169100588Stjr } 170100588Stjr#endif 17112043Speterretry: 17225225Ssteve#ifndef NO_HISTORY 17312043Speter if (parsefile->fd == 0 && el) { 174158143Sstefanf static const char *rl_cp; 175158143Sstefanf static int el_len; 17612043Speter 17712043Speter if (rl_cp == NULL) 178158143Sstefanf rl_cp = el_gets(el, &el_len); 179158143Sstefanf if (rl_cp == NULL) 180238377Spfg nr = el_len == 0 ? 0 : -1; 18112043Speter else { 182158143Sstefanf nr = el_len; 183230118Sjilles if (nr > BUFSIZ) 184230118Sjilles nr = BUFSIZ; 185248980Sjilles memcpy(parsefile->buf, rl_cp, nr); 186158143Sstefanf if (nr != el_len) { 187158143Sstefanf el_len -= nr; 188158143Sstefanf rl_cp += nr; 189158143Sstefanf } else 190158143Sstefanf rl_cp = NULL; 19112043Speter } 19225225Ssteve } else 19325225Ssteve#endif 194248980Sjilles nr = read(parsefile->fd, parsefile->buf, BUFSIZ); 19512043Speter 19612043Speter if (nr <= 0) { 19712043Speter if (nr < 0) { 19812043Speter if (errno == EINTR) 19912043Speter goto retry; 20012043Speter if (parsefile->fd == 0 && errno == EWOULDBLOCK) { 20112043Speter int flags = fcntl(0, F_GETFL, 0); 20212043Speter if (flags >= 0 && flags & O_NONBLOCK) { 20312043Speter flags &=~ O_NONBLOCK; 20412043Speter if (fcntl(0, F_SETFL, flags) >= 0) { 205199629Sjilles out2fmt_flush("sh: turning off NDELAY mode\n"); 20612043Speter goto retry; 20712043Speter } 20812043Speter } 20912043Speter } 21012043Speter } 21120425Ssteve nr = -1; 21212043Speter } 21312043Speter return nr; 21412043Speter} 21512043Speter 2161556Srgrimes/* 2171556Srgrimes * Refill the input buffer and return the next input character: 2181556Srgrimes * 2191556Srgrimes * 1) If a string was pushed back on the input, pop it; 2201556Srgrimes * 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading 2211556Srgrimes * from a string so we can't refill the buffer, return EOF. 22220425Ssteve * 3) If there is more in this buffer, use it else call read to fill it. 22320425Ssteve * 4) Process input up to the next newline, deleting nul characters. 2241556Srgrimes */ 2251556Srgrimes 2261556Srgrimesint 22790111Simppreadbuffer(void) 22820425Ssteve{ 22912043Speter char *p, *q; 23012043Speter int more; 23112043Speter int something; 23212043Speter char savec; 2331556Srgrimes 2341556Srgrimes if (parsefile->strpush) { 2351556Srgrimes popstring(); 2361556Srgrimes if (--parsenleft >= 0) 2371556Srgrimes return (*parsenextc++); 2381556Srgrimes } 2391556Srgrimes if (parsenleft == EOF_NLEFT || parsefile->buf == NULL) 2401556Srgrimes return PEOF; 2411556Srgrimes flushout(&output); 2421556Srgrimes flushout(&errout); 2431556Srgrimes 24412043Speteragain: 24512043Speter if (parselleft <= 0) { 24625225Ssteve if ((parselleft = preadfd()) == -1) { 24712043Speter parselleft = parsenleft = EOF_NLEFT; 24812043Speter return PEOF; 2491556Srgrimes } 2501556Srgrimes } 2511556Srgrimes 252248980Sjilles q = p = parsefile->buf + (parsenextc - parsefile->buf); 25312043Speter 2541556Srgrimes /* delete nul characters */ 2551556Srgrimes something = 0; 25612043Speter for (more = 1; more;) { 25712043Speter switch (*p) { 25812043Speter case '\0': 25912043Speter p++; /* Skip nul */ 26012043Speter goto check; 26112043Speter 26212043Speter case '\t': 26312043Speter case ' ': 2641556Srgrimes break; 26512043Speter 26612043Speter case '\n': 26712043Speter parsenleft = q - parsenextc; 26812043Speter more = 0; /* Stop processing here */ 26912043Speter break; 27012043Speter 27112043Speter default: 2721556Srgrimes something = 1; 27312043Speter break; 2741556Srgrimes } 27512043Speter 27612043Speter *q++ = *p++; 27712043Spetercheck: 27812043Speter if (--parselleft <= 0) { 27912043Speter parsenleft = q - parsenextc - 1; 28012043Speter if (parsenleft < 0) 28112043Speter goto again; 28212043Speter *q = '\0'; 28312043Speter more = 0; 28412043Speter } 2851556Srgrimes } 28612043Speter 28712043Speter savec = *q; 2881556Srgrimes *q = '\0'; 2891556Srgrimes 29018018Speter#ifndef NO_HISTORY 2911556Srgrimes if (parsefile->fd == 0 && hist && something) { 29284261Sobrien HistEvent he; 2931556Srgrimes INTOFF; 29484261Sobrien history(hist, &he, whichprompt == 1 ? H_ENTER : H_ADD, 29584261Sobrien parsenextc); 2961556Srgrimes INTON; 2971556Srgrimes } 29818018Speter#endif 29912043Speter 3001556Srgrimes if (vflag) { 30112043Speter out2str(parsenextc); 3021556Srgrimes flushout(out2); 3031556Srgrimes } 30412043Speter 30512043Speter *q = savec; 30612043Speter 3071556Srgrimes return *parsenextc++; 3081556Srgrimes} 3091556Srgrimes 3101556Srgrimes/* 311194128Sjilles * Returns if we are certain we are at EOF. Does not cause any more input 312194128Sjilles * to be read from the outside world. 313194128Sjilles */ 314194128Sjilles 315194128Sjillesint 316194128Sjillespreadateof(void) 317194128Sjilles{ 318194128Sjilles if (parsenleft > 0) 319194128Sjilles return 0; 320194128Sjilles if (parsefile->strpush) 321194128Sjilles return 0; 322194128Sjilles if (parsenleft == EOF_NLEFT || parsefile->buf == NULL) 323194128Sjilles return 1; 324194128Sjilles return 0; 325194128Sjilles} 326194128Sjilles 327194128Sjilles/* 3281556Srgrimes * Undo the last call to pgetc. Only one character may be pushed back. 3291556Srgrimes * PEOF may be pushed back. 3301556Srgrimes */ 3311556Srgrimes 3321556Srgrimesvoid 33390111Simppungetc(void) 33490111Simp{ 3351556Srgrimes parsenleft++; 3361556Srgrimes parsenextc--; 3371556Srgrimes} 3381556Srgrimes 3391556Srgrimes/* 3401556Srgrimes * Push a string back onto the input at this current parsefile level. 3411556Srgrimes * We handle aliases this way. 3421556Srgrimes */ 3431556Srgrimesvoid 344242895Sjillespushstring(char *s, int len, struct alias *ap) 34590111Simp{ 3461556Srgrimes struct strpush *sp; 3471556Srgrimes 3481556Srgrimes INTOFF; 349199629Sjilles/*out2fmt_flush("*** calling pushstring: %s, %d\n", s, len);*/ 3501556Srgrimes if (parsefile->strpush) { 3511556Srgrimes sp = ckmalloc(sizeof (struct strpush)); 3521556Srgrimes sp->prev = parsefile->strpush; 3531556Srgrimes parsefile->strpush = sp; 3541556Srgrimes } else 3551556Srgrimes sp = parsefile->strpush = &(parsefile->basestrpush); 3561556Srgrimes sp->prevstring = parsenextc; 3571556Srgrimes sp->prevnleft = parsenleft; 35812043Speter sp->prevlleft = parselleft; 359242895Sjilles sp->ap = ap; 3601556Srgrimes if (ap) 361242895Sjilles ap->flag |= ALIASINUSE; 3621556Srgrimes parsenextc = s; 3631556Srgrimes parsenleft = len; 3641556Srgrimes INTON; 3651556Srgrimes} 3661556Srgrimes 367229220Sjillesstatic void 36890111Simppopstring(void) 3691556Srgrimes{ 3701556Srgrimes struct strpush *sp = parsefile->strpush; 3711556Srgrimes 3721556Srgrimes INTOFF; 3731556Srgrimes parsenextc = sp->prevstring; 3741556Srgrimes parsenleft = sp->prevnleft; 37512043Speter parselleft = sp->prevlleft; 376199629Sjilles/*out2fmt_flush("*** calling popstring: restoring to '%s'\n", parsenextc);*/ 3771556Srgrimes if (sp->ap) 3781556Srgrimes sp->ap->flag &= ~ALIASINUSE; 3791556Srgrimes parsefile->strpush = sp->prev; 3801556Srgrimes if (sp != &(parsefile->basestrpush)) 3811556Srgrimes ckfree(sp); 3821556Srgrimes INTON; 3831556Srgrimes} 3841556Srgrimes 3851556Srgrimes/* 3861556Srgrimes * Set the input to take input from a file. If push is set, push the 3871556Srgrimes * old input onto the stack first. 3881556Srgrimes */ 3891556Srgrimes 3901556Srgrimesvoid 391200956Sjillessetinputfile(const char *fname, int push) 39217987Speter{ 3931556Srgrimes int fd; 3941556Srgrimes int fd2; 3951556Srgrimes 3961556Srgrimes INTOFF; 397250267Sjilles if ((fd = open(fname, O_RDONLY | O_CLOEXEC)) < 0) 398222684Sjilles error("cannot open %s: %s", fname, strerror(errno)); 3991556Srgrimes if (fd < 10) { 400250267Sjilles fd2 = fcntl(fd, F_DUPFD_CLOEXEC, 10); 4011556Srgrimes close(fd); 4021556Srgrimes if (fd2 < 0) 4031556Srgrimes error("Out of file descriptors"); 4041556Srgrimes fd = fd2; 4051556Srgrimes } 4061556Srgrimes setinputfd(fd, push); 4071556Srgrimes INTON; 4081556Srgrimes} 4091556Srgrimes 4101556Srgrimes 4111556Srgrimes/* 412250267Sjilles * Like setinputfile, but takes an open file descriptor (which should have 413250267Sjilles * its FD_CLOEXEC flag already set). Call this with interrupts off. 4141556Srgrimes */ 4151556Srgrimes 4161556Srgrimesvoid 41790111Simpsetinputfd(int fd, int push) 41817987Speter{ 4191556Srgrimes if (push) { 4201556Srgrimes pushfile(); 421230118Sjilles parsefile->buf = ckmalloc(BUFSIZ + 1); 4221556Srgrimes } 4231556Srgrimes if (parsefile->fd > 0) 4241556Srgrimes close(parsefile->fd); 4251556Srgrimes parsefile->fd = fd; 4261556Srgrimes if (parsefile->buf == NULL) 427230118Sjilles parsefile->buf = ckmalloc(BUFSIZ + 1); 42812043Speter parselleft = parsenleft = 0; 4291556Srgrimes plinno = 1; 4301556Srgrimes} 4311556Srgrimes 4321556Srgrimes 4331556Srgrimes/* 4341556Srgrimes * Like setinputfile, but takes input from a string. 4351556Srgrimes */ 4361556Srgrimes 4371556Srgrimesvoid 438248980Sjillessetinputstring(const char *string, int push) 43990111Simp{ 4401556Srgrimes INTOFF; 4411556Srgrimes if (push) 4421556Srgrimes pushfile(); 4431556Srgrimes parsenextc = string; 44412043Speter parselleft = parsenleft = strlen(string); 4451556Srgrimes parsefile->buf = NULL; 4461556Srgrimes plinno = 1; 4471556Srgrimes INTON; 4481556Srgrimes} 4491556Srgrimes 4501556Srgrimes 4511556Srgrimes 4521556Srgrimes/* 4531556Srgrimes * To handle the "." command, a stack of input files is used. Pushfile 4541556Srgrimes * adds a new entry to the stack and popfile restores the previous level. 4551556Srgrimes */ 4561556Srgrimes 457213811Sobrienstatic void 45890111Simppushfile(void) 45990111Simp{ 4601556Srgrimes struct parsefile *pf; 4611556Srgrimes 4621556Srgrimes parsefile->nleft = parsenleft; 46312043Speter parsefile->lleft = parselleft; 4641556Srgrimes parsefile->nextc = parsenextc; 4651556Srgrimes parsefile->linno = plinno; 4661556Srgrimes pf = (struct parsefile *)ckmalloc(sizeof (struct parsefile)); 4671556Srgrimes pf->prev = parsefile; 4681556Srgrimes pf->fd = -1; 4691556Srgrimes pf->strpush = NULL; 4701556Srgrimes pf->basestrpush.prev = NULL; 4711556Srgrimes parsefile = pf; 4721556Srgrimes} 4731556Srgrimes 4741556Srgrimes 4751556Srgrimesvoid 47690111Simppopfile(void) 47790111Simp{ 4781556Srgrimes struct parsefile *pf = parsefile; 4791556Srgrimes 4801556Srgrimes INTOFF; 4811556Srgrimes if (pf->fd >= 0) 4821556Srgrimes close(pf->fd); 4831556Srgrimes if (pf->buf) 4841556Srgrimes ckfree(pf->buf); 4851556Srgrimes while (pf->strpush) 4861556Srgrimes popstring(); 4871556Srgrimes parsefile = pf->prev; 4881556Srgrimes ckfree(pf); 4891556Srgrimes parsenleft = parsefile->nleft; 49012043Speter parselleft = parsefile->lleft; 4911556Srgrimes parsenextc = parsefile->nextc; 4921556Srgrimes plinno = parsefile->linno; 4931556Srgrimes INTON; 4941556Srgrimes} 4951556Srgrimes 4961556Srgrimes 4971556Srgrimes/* 498199647Sjilles * Return current file (to go back to it later using popfilesupto()). 499199647Sjilles */ 500199647Sjilles 501199647Sjillesstruct parsefile * 502199647Sjillesgetcurrentfile(void) 503199647Sjilles{ 504199647Sjilles return parsefile; 505199647Sjilles} 506199647Sjilles 507199647Sjilles 508199647Sjilles/* 509199647Sjilles * Pop files until the given file is on top again. Useful for regular 510199647Sjilles * builtins that read shell commands from files or strings. 511199647Sjilles * If the given file is not an active file, an error is raised. 512199647Sjilles */ 513199647Sjilles 514199647Sjillesvoid 515199647Sjillespopfilesupto(struct parsefile *file) 516199647Sjilles{ 517199647Sjilles while (parsefile != file && parsefile != &basepf) 518199647Sjilles popfile(); 519199647Sjilles if (parsefile != file) 520199647Sjilles error("popfilesupto() misused"); 521199647Sjilles} 522199647Sjilles 523199647Sjilles/* 5241556Srgrimes * Return to top level. 5251556Srgrimes */ 5261556Srgrimes 5271556Srgrimesvoid 52890111Simppopallfiles(void) 52990111Simp{ 5301556Srgrimes while (parsefile != &basepf) 5311556Srgrimes popfile(); 5321556Srgrimes} 5331556Srgrimes 5341556Srgrimes 5351556Srgrimes 5361556Srgrimes/* 5371556Srgrimes * Close the file(s) that the shell is reading commands from. Called 5381556Srgrimes * after a fork is done. 5391556Srgrimes */ 5401556Srgrimes 5411556Srgrimesvoid 54290111Simpclosescript(void) 54390111Simp{ 5441556Srgrimes popallfiles(); 5451556Srgrimes if (parsefile->fd > 0) { 5461556Srgrimes close(parsefile->fd); 5471556Srgrimes parsefile->fd = 0; 5481556Srgrimes } 5491556Srgrimes} 550