summaryrefslogtreecommitdiffstats
path: root/src/kash/exec.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--src/kash/exec.c1352
1 files changed, 1352 insertions, 0 deletions
diff --git a/src/kash/exec.c b/src/kash/exec.c
new file mode 100644
index 0000000..ec6d629
--- /dev/null
+++ b/src/kash/exec.c
@@ -0,0 +1,1352 @@
+/* $NetBSD: exec.c,v 1.37 2003/08/07 09:05:31 agc Exp $ */
+
+/*-
+ * 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.
+ */
+
+#if 0
+#ifndef lint
+static char sccsid[] = "@(#)exec.c 8.4 (Berkeley) 6/8/95";
+#else
+__RCSID("$NetBSD: exec.c,v 1.37 2003/08/07 09:05:31 agc Exp $");
+#endif /* not lint */
+#endif
+
+#include <sys/types.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+
+/*
+ * When commands are first encountered, they are entered in a hash table.
+ * This ensures that a full path search will not have to be done for them
+ * on each invocation.
+ *
+ * We should investigate converting to a linear search, even though that
+ * would make the command name "hash" a misnomer.
+ */
+
+#include "shell.h"
+#include "main.h"
+#include "nodes.h"
+#include "parser.h"
+#include "redir.h"
+#include "eval.h"
+#include "exec.h"
+#include "builtins.h"
+#include "var.h"
+#include "options.h"
+#include "input.h"
+#include "output.h"
+#include "syntax.h"
+#include "memalloc.h"
+#include "error.h"
+#include "init.h"
+#include "mystring.h"
+#include "show.h"
+#include "jobs.h"
+#include "alias.h"
+#ifdef __INNOTEK_LIBC__
+#include <InnoTekLIBC/backend.h>
+#endif
+#include "shinstance.h"
+
+//#define CMDTABLESIZE 31 /* should be prime */
+//#define ARB 1 /* actual size determined at run time */
+//
+//
+//
+//struct tblentry {
+// struct tblentry *next; /* next entry in hash chain */
+// union param param; /* definition of builtin function */
+// short cmdtype; /* index identifying command */
+// char rehash; /* if set, cd done since entry created */
+// char cmdname[ARB]; /* name of command */
+//};
+//
+//
+//STATIC struct tblentry *cmdtable[CMDTABLESIZE];
+//STATIC int builtinloc = -1; /* index in path of %builtin, or -1 */
+//int exerrno = 0; /* Last exec error */
+#ifdef PC_EXE_EXTS
+STATIC const char * const g_exe_suffixes[] = { "", ".exe", ".cmd", ".btm", ".com" };
+#endif
+
+
+STATIC void tryexec(shinstance *, char *, char **, char **, int);
+STATIC void execinterp(shinstance *, char **, char **);
+STATIC void printentry(shinstance *, struct tblentry *, int);
+STATIC void clearcmdentry(shinstance *, int);
+STATIC struct tblentry *cmdlookup(shinstance *, const char *, int);
+STATIC void delete_cmd_entry(shinstance *);
+#ifdef PC_EXE_EXTS
+STATIC int stat_pc_exec_exts(shinstance *, char *fullname, int has_ext, int *suffixp);
+#endif
+
+
+extern char *const parsekwd[];
+
+#ifndef SH_FORKED_MODE
+void
+subshellinitexec(shinstance *psh, shinstance *inherit)
+{
+ unsigned i;
+ for (i = 0; i < K_ELEMENTS(inherit->cmdtable); i++) {
+ struct tblentry const *csrc = inherit->cmdtable[i];
+ if (!csrc) {
+ } else {
+ struct tblentry **ppdst = &psh->cmdtable[i];
+ do
+ {
+ size_t const namesize = strlen(csrc->cmdname) + 1;
+ size_t const entrysize = offsetof(struct tblentry, cmdname) + namesize;
+ struct tblentry *dst = (struct tblentry *)ckmalloc(psh, entrysize);
+ memcpy(dst->cmdname, csrc->cmdname, namesize);
+ dst->rehash = csrc->rehash;
+ dst->cmdtype = csrc->cmdtype;
+
+ dst->param.func = NULL;
+ switch (csrc->cmdtype) {
+ case CMDUNKNOWN:
+ case CMDNORMAL:
+ dst->param.n.index = csrc->param.n.index;
+ dst->param.n.suffix = csrc->param.n.suffix;
+ break;
+ case CMDFUNCTION:
+ dst->param.func = copyfunc(psh, csrc->param.func); /** @todo optimize function allocations */
+ break;
+ case CMDBUILTIN:
+ case CMDSPLBLTIN:
+ dst->param.bltin = csrc->param.bltin;
+ break;
+ }
+
+ *ppdst = dst;
+ ppdst = &dst->next;
+
+ csrc = csrc->next;
+ } while (csrc);
+ *ppdst = NULL;
+ }
+ }
+
+ psh->builtinloc = inherit->builtinloc;
+}
+#endif /* SH_FORKED_MODE */
+
+
+/*
+ * Check if 'path' is an absolute (starts with root) path or not.
+ */
+K_INLINE int isabspath(const char *path)
+{
+#if K_OS == K_OS_WINDOWS || K_OS == K_OS_OS2
+ if (path[0] == '/' || path[0] == '\\') {
+ if ( (path[1] == '/' || path[1] == '\\')
+ && (path[2] != '/' && path[2] != '\\' && path[2]))
+ return 1;
+ } else if (path[0] && path[1] == ':' && (path[2] == '\\' || path[2] == '/') && isalpha(path[0])) {
+ return 1;
+ }
+ return 0;
+#else
+ return path[0] == '/';
+#endif
+}
+
+/*
+ * Checks if the filename include a path or not.
+ */
+K_INLINE int haspath(const char *name)
+{
+#if K_OS == K_OS_WINDOWS || K_OS == K_OS_OS2
+ return strchr(name, '/') != NULL
+ || strchr(name, '\\') != NULL
+ || (name[0] && name[1] == ':');
+#else
+ return strchr(name, '/') != NULL;
+#endif
+}
+
+
+/*
+ * Exec a program. Never returns. If you change this routine, you may
+ * have to change the find_command routine as well.
+ */
+
+SH_NORETURN_1 void
+shellexec(shinstance *psh, char **argv, char **envp, const char *path, int idx, int suffix)
+{
+ char *cmdname;
+ int e;
+ const char *argv0 = argv[0];
+ int argv0len = (int)strlen(argv0);
+ char kmkcmd[48];
+#ifdef PC_EXE_EXTS
+ int has_ext = argv0len - 4;
+ has_ext = has_ext > 0
+ && argv0[has_ext] == '.'
+ /* use strstr and upper/lower permuated extensions to avoid multiple strcasecmp calls. */
+ && strstr("exe;" "Exe;" "EXe;" "EXE;" "ExE;" "eXe;" "eXE;" "exE;"
+ "cmd;" "Cmd;" "CMd;" "CMD;" "CmD;" "cMd;" "cMD;" "cmD;"
+ "com;" "Com;" "COm;" "COM;" "CoM;" "cOm;" "cOM;" "coM;"
+ "bat;" "Bat;" "BAt;" "BAT;" "BaT;" "bAt;" "bAT;" "baT;"
+ "btm;" "Btm;" "BTm;" "BTM;" "BtM;" "bTm;" "bTM;" "btM;",
+ argv0 + has_ext + 1)
+ != NULL;
+#else
+ const int has_ext = 1;
+#endif
+ TRACE((psh, "shellexec: argv[0]=%s idx=%d suffix=%d\n", argv0, idx, suffix));
+ if (haspath(argv0)) {
+#ifdef PC_EXE_EXTS
+ if (!has_ext && suffix && (unsigned)suffix < K_ELEMENTS(g_exe_suffixes)) {
+ size_t sufflen = strlen(g_exe_suffixes[suffix]);
+ cmdname = stalloc(psh, argv0len + sufflen + 1);
+ memcpy(cmdname, argv0, argv0len);
+ memcpy(cmdname + argv0len, g_exe_suffixes[suffix], sufflen + 1);
+ tryexec(psh, cmdname, argv, envp, 1);
+ } else
+#endif
+ {
+ cmdname = stalloc(psh, argv0len + 5);
+ memcpy(cmdname, argv0, argv0len + 1);
+ tryexec(psh, cmdname, argv, envp, has_ext);
+ }
+ TRACE((psh, "shellexec: cmdname=%s\n", cmdname));
+ stunalloc(psh, cmdname);
+ e = errno;
+ } else {
+ /* Before we search the PATH, transform kmk_builtin_% to kmk_% so we don't
+ need to be too careful mixing internal and external kmk commands. */
+ if ( argv0len > 12
+ && argv0len < 42
+ && strncmp(argv0, "kmk_builtin_", 12) == 0
+ && strpbrk(argv0 + 12, "./\\-:;<>") == NULL) {
+ memcpy(kmkcmd, "kmk_", 4);
+ memcpy(&kmkcmd[4], argv0 + 12, argv0len + 1 - 8);
+ TRACE((psh, "shellexec: dropped '_builtin' from %s to %s\n", argv0, kmkcmd));
+ argv0len -= 8;
+ argv0 = kmkcmd;
+ }
+
+ e = ENOENT;
+ while ((cmdname = padvance(psh, &path, argv0)) != NULL) {
+ if (--idx < 0 && psh->pathopt == NULL) {
+#ifdef PC_EXE_EXTS
+ if (!has_ext && idx == -1 && suffix && (unsigned)suffix < K_ELEMENTS(g_exe_suffixes)) {
+ strcat(cmdname, g_exe_suffixes[suffix]);
+ tryexec(psh, cmdname, argv, envp, 1);
+ } else
+#endif
+ tryexec(psh, cmdname, argv, envp, has_ext);
+ if (errno != ENOENT && errno != ENOTDIR)
+ e = errno;
+ }
+ stunalloc(psh, cmdname);
+ }
+ }
+
+ /* Map to POSIX errors */
+ switch (e) {
+ case EACCES:
+ psh->exerrno = 126;
+ break;
+ case ENOENT:
+ psh->exerrno = 127;
+ break;
+ default:
+ psh->exerrno = 2;
+ break;
+ }
+ TRACE((psh, "shellexec failed for '%s', errno %d, suppressint %d\n",
+ argv[0], e, psh->suppressint ));
+ exerror(psh, EXEXEC, "%s: %s", argv[0], errmsg(psh, e, E_EXEC));
+ /* NOTREACHED */
+}
+
+
+STATIC void
+tryexec(shinstance *psh, char *cmd, char **argv, char **envp, int has_ext)
+{
+ int e;
+#ifdef EXEC_HASH_BANG_SCRIPT
+ char *p;
+#endif
+#ifdef PC_EXE_EXTS
+ /* exploit the effect of stat_pc_exec_exts which adds the
+ * correct extentions to the file. */
+ if (!has_ext) {
+ int suffix;
+ stat_pc_exec_exts(psh, cmd, 0, &suffix);
+ }
+#endif
+#if defined(__INNOTEK_LIBC__) && defined(EXEC_HASH_BANG_SCRIPT)
+ __libc_Back_gfProcessHandleHashBangScripts = 0;
+#endif
+
+#ifdef SYSV
+ do {
+ sh_execve(psh, cmd, argv, envp);
+ } while (errno == EINTR);
+#else
+ sh_execve(psh, cmd, (const char * const*)argv, (const char * const*)envp);
+#endif
+ e = errno;
+ if (e == ENOEXEC) {
+ initshellproc(psh);
+ setinputfile(psh, cmd, 0);
+ if (psh->commandnamemalloc) {
+ sh_free(psh, psh->commandname);
+ psh->commandnamemalloc = 0;
+ }
+ if (psh->arg0malloc)
+ sh_free(psh, psh->arg0);
+ psh->commandname = psh->arg0 = savestr(psh, argv[0]);
+ psh->arg0malloc = 1;
+#ifdef EXEC_HASH_BANG_SCRIPT
+ pgetc(psh); pungetc(psh); /* fill up input buffer */
+ p = psh->parsenextc;
+ if (psh->parsenleft > 2 && p[0] == '#' && p[1] == '!') {
+ argv[0] = cmd;
+ execinterp(psh, argv, envp);
+ }
+#endif
+ setparam(psh, argv + 1);
+ exraise(psh, EXSHELLPROC);
+ }
+ errno = e;
+}
+
+#ifdef EXEC_HASH_BANG_SCRIPT
+
+/*
+ * Checks if NAME is the (base) name of the shell executable or something
+ * very similar.
+ */
+STATIC int
+is_shell_exe_name(const char *name)
+{
+ return equal(name, "kmk_ash")
+ || equal(name, "kmk_sh")
+ || equal(name, "kash")
+ || equal(name, "sh");
+}
+
+/*
+ * Execute an interpreter introduced by "#!", for systems where this
+ * feature has not been built into the kernel. If the interpreter is
+ * the shell, return (effectively ignoring the "#!"). If the execution
+ * of the interpreter fails, exit.
+ *
+ * This code peeks inside the input buffer in order to avoid actually
+ * reading any input. It would benefit from a rewrite.
+ */
+
+#define NEWARGS 16
+
+STATIC void
+execinterp(shinstance *psh, char **argv, char **envp)
+{
+ int n;
+ char *inp;
+ char *outp;
+ char c;
+ char *p;
+ char **ap;
+ char *newargs[NEWARGS];
+ intptr_t i;
+ char **ap2;
+ char **new;
+
+ /* Split the string into arguments. */
+ n = psh->parsenleft - 2;
+ inp = psh->parsenextc + 2;
+ ap = newargs;
+ for (;;) {
+ while (--n >= 0 && (*inp == ' ' || *inp == '\t'))
+ inp++;
+ if (n < 0)
+ goto bad;
+ if ((c = *inp++) == '\n')
+ break;
+ if (ap == &newargs[NEWARGS])
+bad: error(psh, "Bad #! line");
+ STARTSTACKSTR(psh, outp);
+ do {
+ STPUTC(psh, c, outp);
+ } while (--n >= 0 && (c = *inp++) != ' ' && c != '\t' && c != '\n');
+ STPUTC(psh, '\0', outp);
+ n++, inp--;
+ *ap++ = grabstackstr(psh, outp);
+ }
+
+ /* /usr/bin/env emulation, very common with kash/kmk_ash. */
+ i = ap - newargs;
+ if (i > 1 && equal(newargs[0], "/usr/bin/env")) {
+ if ( !strchr(newargs[1], '=')
+ && newargs[1][0] != '-') {
+ /* shellexec below searches the PATH for us, so just
+ drop /usr/bin/env. */
+ TRACE((psh, "hash bang /usr/bin/env utility, dropping /usr/bin/env\n"));
+ ap--;
+ i--;
+ for (n = 0; n < i; n++)
+ newargs[n] = newargs[n + 1];
+ } /* else: complicated invocation */
+ }
+
+ /* If the interpreter is the shell or a similar shell, there is
+ no need to exec. */
+ if (i == 1) {
+ p = strrchr(newargs[0], '/');
+ if (!p)
+ p = newargs[0];
+ if (is_shell_exe_name(p)) {
+ TRACE((psh, "hash bang self\n"));
+ return;
+ }
+ }
+
+ /* Combine the two argument lists and exec. */
+ i = (char *)ap - (char *)newargs; /* size in bytes */
+ if (i == 0)
+ error(psh, "Bad #! line");
+ for (ap2 = argv ; *ap2++ != NULL ; );
+ new = ckmalloc(psh, i + ((char *)ap2 - (char *)argv));
+ ap = newargs, ap2 = new;
+ while ((i -= sizeof (char **)) >= 0)
+ *ap2++ = *ap++;
+ ap = argv;
+ while ((*ap2++ = *ap++))
+ /* nothing*/;
+ TRACE((psh, "hash bang '%s'\n", new[0]));
+ shellexec(psh, new, envp, pathval(psh), 0, -1);
+ /* NOTREACHED */
+}
+
+#endif /* EXEC_HASH_BANG_SCRIPT */
+
+
+/*
+ * Do a path search. The variable path (passed by reference) should be
+ * set to the start of the path before the first call; padvance will update
+ * this value as it proceeds. Successive calls to padvance will return
+ * the possible path expansions in sequence. If an option (indicated by
+ * a percent sign) appears in the path entry then the global variable
+ * psh->pathopt will be set to point to it; otherwise psh->pathopt will be set to
+ * NULL.
+ */
+
+//const char *pathopt;
+
+char *
+padvance(shinstance *psh, const char **path, const char *name)
+{
+ const char *p;
+ char *q;
+ const char *start;
+ int len;
+
+ if (*path == NULL)
+ return NULL;
+ start = *path;
+#ifdef PC_PATH_SEP
+ for (p = start ; *p && *p != ';' && *p != '%' ; p++);
+#else
+ for (p = start ; *p && *p != ':' && *p != '%' ; p++);
+#endif
+ len = (int)(p - start + strlen(name) + 2); /* "2" is for '/' and '\0' */
+#ifdef PC_EXE_EXTS
+ len += 4; /* "4" is for .exe/.com/.cmd/.bat/.btm */
+#endif
+ while (stackblocksize(psh) < len)
+ growstackblock(psh);
+ q = stackblock(psh);
+ if (p != start) {
+ memcpy(q, start, p - start);
+ q += p - start;
+ *q++ = '/';
+ }
+ strcpy(q, name);
+ psh->pathopt = NULL;
+ if (*p == '%') {
+ psh->pathopt = ++p;
+#ifdef PC_PATH_SEP
+ while (*p && *p != ';') p++;
+#else
+ while (*p && *p != ':') p++;
+#endif
+ }
+#ifdef PC_PATH_SEP
+ if (*p == ';')
+#else
+ if (*p == ':')
+#endif
+ *path = p + 1;
+ else
+ *path = NULL;
+ return stalloc(psh, len);
+}
+
+
+#ifdef PC_EXE_EXTS
+STATIC int stat_pc_exec_exts(shinstance *psh, char *fullname, int has_ext, int *suffixp)
+{
+ int isreg;
+
+ /* skip the SYSV crap */
+ if ((isreg = shfile_stat_isreg(&psh->fdtab, fullname)) >= 1) {
+ *suffixp = 0;
+ return isreg;
+ }
+ if (!has_ext && errno == ENOENT)
+ {
+ /* Ignore non-regular files here. */
+ char *psz = strchr(fullname, '\0');
+ int i;
+ for (i = 1 /*first entry is empty*/; i < K_ELEMENTS(g_exe_suffixes); i++) {
+ strcpy(psz, g_exe_suffixes[i]);
+ if ((isreg = shfile_stat_isreg(&psh->fdtab, fullname)) >= 1) {
+ *suffixp = i;
+ return isreg;
+ }
+ if (isreg < 0 && errno != ENOENT && errno != ENOTDIR)
+ break;
+ }
+ }
+ *suffixp = -1;
+ return isreg;
+}
+#endif /* PC_EXE_EXTS */
+
+
+
+/*** Command hashing code ***/
+
+
+int
+hashcmd(shinstance *psh, int argc, char **argv)
+{
+ struct tblentry **pp;
+ struct tblentry *cmdp;
+ int c;
+ int verbose;
+ struct cmdentry entry;
+ char *name;
+
+ verbose = 0;
+ while ((c = nextopt(psh, "rv")) != '\0') {
+ if (c == 'r') {
+ clearcmdentry(psh, 0);
+ } else if (c == 'v') {
+ verbose++;
+ }
+ }
+ if (*psh->argptr == NULL) {
+ for (pp = psh->cmdtable ; pp < &psh->cmdtable[CMDTABLESIZE] ; pp++) {
+ for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
+ if (verbose || cmdp->cmdtype == CMDNORMAL)
+ printentry(psh, cmdp, verbose);
+ }
+ }
+ return 0;
+ }
+ while ((name = *psh->argptr) != NULL) {
+ if ((cmdp = cmdlookup(psh, name, 0)) != NULL
+ && (cmdp->cmdtype == CMDNORMAL
+ || (cmdp->cmdtype == CMDBUILTIN && psh->builtinloc >= 0)))
+ delete_cmd_entry(psh);
+ find_command(psh, name, &entry, DO_ERR, pathval(psh));
+ if (verbose) {
+ if (entry.cmdtype != CMDUNKNOWN) { /* if no error msg */
+ cmdp = cmdlookup(psh, name, 0);
+ printentry(psh, cmdp, verbose);
+ }
+ output_flushall(psh);
+ }
+ psh->argptr++;
+ }
+ return 0;
+}
+
+
+STATIC void
+printentry(shinstance *psh, struct tblentry *cmdp, int verbose)
+{
+ int idx;
+ const char *path;
+ char *name;
+
+ switch (cmdp->cmdtype) {
+ case CMDNORMAL:
+ idx = cmdp->param.n.index;
+ path = pathval(psh);
+ do {
+ name = padvance(psh, &path, cmdp->cmdname);
+ stunalloc(psh, name);
+ } while (--idx >= 0);
+ out1str(psh, name);
+#ifdef PC_EXE_EXTS
+ if ((unsigned)cmdp->param.n.suffix < K_ELEMENTS(g_exe_suffixes))
+ out1str(psh, g_exe_suffixes[cmdp->param.n.suffix]);
+#endif
+ break;
+ case CMDSPLBLTIN:
+ out1fmt(psh, "special builtin %s", cmdp->cmdname);
+ break;
+ case CMDBUILTIN:
+ out1fmt(psh, "builtin %s", cmdp->cmdname);
+ break;
+ case CMDFUNCTION:
+ out1fmt(psh, "function %s", cmdp->cmdname);
+ if (verbose) {
+ struct procstat ps;
+ INTOFF;
+ commandtext(psh, &ps, cmdp->param.func);
+ INTON;
+ out1str(psh, "() { ");
+ out1str(psh, ps.cmd);
+ out1str(psh, "; }");
+ }
+ break;
+ default:
+ error(psh, "internal error: %s cmdtype %d", cmdp->cmdname, cmdp->cmdtype);
+ }
+ if (cmdp->rehash)
+ out1c(psh, '*');
+ out1c(psh, '\n');
+}
+
+
+
+/*
+ * Resolve a command name. If you change this routine, you may have to
+ * change the shellexec routine as well.
+ */
+
+void
+find_command(shinstance *psh, char *name, struct cmdentry *entry, int act, const char *path)
+{
+ struct tblentry *cmdp, loc_cmd;
+ int idx;
+ int prev;
+ char *fullname;
+ int e;
+ int (*bltin)(shinstance*,int,char **);
+ int argv0len = (int)strlen(name);
+ char kmkcmd[48];
+#ifdef PC_EXE_EXTS
+ int has_ext = argv0len - 4;
+ has_ext = has_ext > 0
+ && name[has_ext] == '.'
+ /* use strstr and upper/lower permuated extensions to avoid multiple strcasecmp calls. */
+ && strstr("exe;" "Exe;" "EXe;" "EXE;" "ExE;" "eXe;" "eXE;" "exE;"
+ "cmd;" "Cmd;" "CMd;" "CMD;" "CmD;" "cMd;" "cMD;" "cmD;"
+ "com;" "Com;" "COm;" "COM;" "CoM;" "cOm;" "cOM;" "coM;"
+ "bat;" "Bat;" "BAt;" "BAT;" "BaT;" "bAt;" "bAT;" "baT;"
+ "btm;" "Btm;" "BTm;" "BTM;" "BtM;" "bTm;" "bTM;" "btM;",
+ name + has_ext + 1)
+ != NULL;
+#endif
+
+ /* If name contains a slash, don't use PATH or hash table */
+ if (haspath(name)) {
+ if (act & DO_ABS) {
+ while (shfile_stat_exists(&psh->fdtab, name) < 0) {
+#ifdef SYSV
+ if (errno == EINTR)
+ continue;
+#endif
+ if (errno != ENOENT && errno != ENOTDIR)
+ e = errno;
+ entry->cmdtype = CMDUNKNOWN;
+ entry->u.n.index = -1;
+ entry->u.n.suffix = -1;
+ return;
+ }
+ entry->cmdtype = CMDNORMAL;
+ entry->u.n.index = -1;
+ entry->u.n.suffix = -1;
+ return;
+ }
+ entry->cmdtype = CMDNORMAL;
+ entry->u.n.index = 0;
+ entry->u.n.suffix = 0;
+ return;
+ }
+
+ if (path != pathval(psh))
+ act |= DO_ALTPATH;
+
+ if (act & DO_ALTPATH && strstr(path, "%builtin") != NULL)
+ act |= DO_ALTBLTIN;
+
+ /* If name is in the table, check answer will be ok */
+ if ((cmdp = cmdlookup(psh, name, 0)) != NULL) {
+ do {
+ switch (cmdp->cmdtype) {
+ case CMDNORMAL:
+ if (act & DO_ALTPATH) {
+ cmdp = NULL;
+ continue;
+ }
+ break;
+ case CMDFUNCTION:
+ if (act & DO_NOFUNC) {
+ cmdp = NULL;
+ continue;
+ }
+ break;
+ case CMDBUILTIN:
+ if ((act & DO_ALTBLTIN) || psh->builtinloc >= 0) {
+ cmdp = NULL;
+ continue;
+ }
+ break;
+ }
+ /* if not invalidated by cd, we're done */
+ if (cmdp->rehash == 0)
+ goto success;
+ } while (0);
+ }
+
+ /* If %builtin not in path, check for builtin next */
+ if ((act & DO_ALTPATH ? !(act & DO_ALTBLTIN) : psh->builtinloc < 0) &&
+ (bltin = find_builtin(psh, name)) != 0)
+ goto builtin_success;
+
+ /* We have to search path. */
+ prev = -1; /* where to start */
+ if (cmdp) { /* doing a rehash */
+ if (cmdp->cmdtype == CMDBUILTIN)
+ prev = psh->builtinloc;
+ else
+ prev = cmdp->param.n.index;
+ }
+
+ /* Before we search the PATH, transform kmk_builtin_% to kmk_% so we don't
+ need to be too careful mixing internal and external kmk command. */
+ if ( argv0len > 12
+ && argv0len < (int)sizeof(kmkcmd)
+ && strncmp(name, "kmk_builtin_", 12) == 0
+ && strpbrk(name + 12, "./\\-:;<>") == NULL) {
+ memcpy(kmkcmd, "kmk_", 4);
+ memcpy(&kmkcmd[4], name + 12, argv0len + 1 - 8);
+ TRACE((psh, "find_command: dropped '_builtin' from %s to %s\n", name, kmkcmd));
+ argv0len -= 8;
+ name = kmkcmd;
+ }
+
+ e = ENOENT;
+ idx = -1;
+loop:
+ while ((fullname = padvance(psh, &path, name)) != NULL) {
+#ifdef PC_EXE_EXTS
+ int suffix;
+#endif
+ int isreg;
+ stunalloc(psh, fullname);
+ idx++;
+ if (psh->pathopt) {
+ if (prefix("builtin", psh->pathopt)) {
+ if ((bltin = find_builtin(psh, name)) == 0)
+ goto loop;
+ goto builtin_success;
+ } else if (prefix("func", psh->pathopt)) {
+ /* handled below */
+ } else {
+ /* ignore unimplemented options */
+ goto loop;
+ }
+ }
+ /* if rehash, don't redo absolute path names */
+ if (idx <= prev && isabspath(fullname)) {
+ if (idx < prev)
+ goto loop;
+ TRACE((psh, "searchexec \"%s\": no change\n", name));
+ goto success;
+ }
+#ifdef PC_EXE_EXTS
+ while ((isreg = stat_pc_exec_exts(psh, fullname, has_ext, &suffix)) < 0) {
+#else
+ while ((isreg = shfile_stat_isreg(&psh->fdtab, fullname)) < 0) {
+#endif
+#ifdef SYSV
+ if (errno == EINTR)
+ continue;
+#endif
+ if (errno != ENOENT && errno != ENOTDIR)
+ e = errno;
+
+ goto loop;
+ }
+ e = EACCES; /* if we fail, this will be the error */
+ if (isreg < 1)
+ goto loop;
+ if (psh->pathopt) { /* this is a %func directory */
+ if (act & DO_NOFUNC)
+ goto loop;
+ stalloc(psh, strlen(fullname) + 1);
+ readcmdfile(psh, fullname);
+ if ((cmdp = cmdlookup(psh, name, 0)) == NULL ||
+ cmdp->cmdtype != CMDFUNCTION)
+ error(psh, "%s not defined in %s", name, fullname);
+ stunalloc(psh, fullname);
+ goto success;
+ }
+#ifdef notdef
+ /* XXX this code stops root executing stuff, and is buggy
+ if you need a group from the group list. */
+ if (statb.st_uid == sh_geteuid(psh)) {
+ if ((statb.st_mode & 0100) == 0)
+ goto loop;
+ } else if (statb.st_gid == sh_getegid(psh)) {
+ if ((statb.st_mode & 010) == 0)
+ goto loop;
+ } else {
+ if ((statb.st_mode & 01) == 0)
+ goto loop;
+ }
+#endif
+ TRACE((psh, "searchexec \"%s\" returns \"%s\"\n", name, fullname));
+ INTOFF;
+ if (act & DO_ALTPATH) {
+ stalloc(psh, strlen(fullname) + 1);
+ cmdp = &loc_cmd;
+ } else
+ cmdp = cmdlookup(psh, name, 1);
+ cmdp->cmdtype = CMDNORMAL;
+ cmdp->param.n.index = idx;
+#ifdef PC_EXE_EXTS
+ cmdp->param.n.suffix = suffix;
+#else
+ cmdp->param.n.suffix = 0;
+#endif
+ INTON;
+ goto success;
+ }
+
+ /* We failed. If there was an entry for this command, delete it */
+ if (cmdp)
+ delete_cmd_entry(psh);
+ if (act & DO_ERR)
+ outfmt(psh->out2, "%s: %s\n", name, errmsg(psh, e, E_EXEC));
+ entry->cmdtype = CMDUNKNOWN;
+ return;
+
+builtin_success:
+ INTOFF;
+ if (act & DO_ALTPATH)
+ cmdp = &loc_cmd;
+ else
+ cmdp = cmdlookup(psh, name, 1);
+ if (cmdp->cmdtype == CMDFUNCTION)
+ /* DO_NOFUNC must have been set */
+ cmdp = &loc_cmd;
+ cmdp->cmdtype = CMDBUILTIN;
+ cmdp->param.bltin = bltin;
+ INTON;
+success:
+ cmdp->rehash = 0;
+ entry->cmdtype = cmdp->cmdtype;
+ entry->u = cmdp->param;
+}
+
+
+
+/*
+ * Search the table of builtin commands.
+ */
+
+int
+(*find_builtin(shinstance *psh, char *name))(shinstance *psh, int, char **)
+{
+ const struct builtincmd *bp;
+
+ for (bp = builtincmd ; bp->name ; bp++) {
+ if (*bp->name == *name && equal(bp->name, name))
+ return bp->builtin;
+ }
+ return 0;
+}
+
+int
+(*find_splbltin(shinstance *psh, char *name))(shinstance *psh, int, char **)
+{
+ const struct builtincmd *bp;
+
+ for (bp = splbltincmd ; bp->name ; bp++) {
+ if (*bp->name == *name && equal(bp->name, name))
+ return bp->builtin;
+ }
+ return 0;
+}
+
+/*
+ * At shell startup put special builtins into hash table.
+ * ensures they are executed first (see posix).
+ * We stop functions being added with the same name
+ * (as they are impossible to call)
+ */
+
+void
+hash_special_builtins(shinstance *psh)
+{
+ const struct builtincmd *bp;
+ struct tblentry *cmdp;
+
+ for (bp = splbltincmd ; bp->name ; bp++) {
+ cmdp = cmdlookup(psh, bp->name, 1);
+ cmdp->cmdtype = CMDSPLBLTIN;
+ cmdp->param.bltin = bp->builtin;
+ }
+}
+
+
+
+/*
+ * Called when a cd is done. Marks all commands so the next time they
+ * are executed they will be rehashed.
+ */
+
+void
+hashcd(shinstance *psh)
+{
+ struct tblentry **pp;
+ struct tblentry *cmdp;
+
+ for (pp = psh->cmdtable ; pp < &psh->cmdtable[CMDTABLESIZE] ; pp++) {
+ for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
+ if (cmdp->cmdtype == CMDNORMAL
+ || (cmdp->cmdtype == CMDBUILTIN && psh->builtinloc >= 0))
+ cmdp->rehash = 1;
+ }
+ }
+}
+
+
+
+/*
+ * Fix command hash table when PATH changed.
+ * Called before PATH is changed. The argument is the new value of PATH;
+ * pathval(psh) still returns the old value at this point.
+ * Called with interrupts off.
+ */
+
+void
+changepath(shinstance *psh, const char *newval)
+{
+ const char *old, *new;
+ int idx;
+ int firstchange;
+ int bltin;
+
+ old = pathval(psh);
+ new = newval;
+ firstchange = 9999; /* assume no change */
+ idx = 0;
+ bltin = -1;
+ for (;;) {
+ if (*old != *new) {
+ firstchange = idx;
+#ifdef PC_PATH_SEP
+ if ((*old == '\0' && *new == ';')
+ || (*old == ';' && *new == '\0'))
+#else
+ if ((*old == '\0' && *new == ':')
+ || (*old == ':' && *new == '\0'))
+#endif
+ firstchange++;
+ old = new; /* ignore subsequent differences */
+ }
+ if (*new == '\0')
+ break;
+ if (*new == '%' && bltin < 0 && prefix("builtin", new + 1))
+ bltin = idx;
+#ifdef PC_PATH_SEP
+ if (*new == ';') {
+#else
+ if (*new == ':') {
+#endif
+ idx++;
+ }
+ new++, old++;
+ }
+ if (psh->builtinloc < 0 && bltin >= 0)
+ psh->builtinloc = bltin; /* zap builtins */
+ if (psh->builtinloc >= 0 && bltin < 0)
+ firstchange = 0;
+ clearcmdentry(psh, firstchange);
+ psh->builtinloc = bltin;
+}
+
+
+/*
+ * Clear out command entries. The argument specifies the first entry in
+ * PATH which has changed.
+ */
+
+STATIC void
+clearcmdentry(shinstance *psh, int firstchange)
+{
+ struct tblentry **tblp;
+ struct tblentry **pp;
+ struct tblentry *cmdp;
+
+ INTOFF;
+ for (tblp = psh->cmdtable ; tblp < &psh->cmdtable[CMDTABLESIZE] ; tblp++) {
+ pp = tblp;
+ while ((cmdp = *pp) != NULL) {
+ if ((cmdp->cmdtype == CMDNORMAL &&
+ cmdp->param.n.index >= firstchange)
+ || (cmdp->cmdtype == CMDBUILTIN &&
+ psh->builtinloc >= firstchange)) {
+ *pp = cmdp->next;
+ ckfree(psh, cmdp);
+ } else {
+ pp = &cmdp->next;
+ }
+ }
+ }
+ INTON;
+}
+
+
+/*
+ * Delete all functions.
+ */
+
+#ifdef mkinit
+MKINIT void deletefuncs(struct shinstance *);
+MKINIT void hash_special_builtins(struct shinstance *);
+
+INIT {
+ hash_special_builtins(psh);
+}
+
+SHELLPROC {
+ deletefuncs(psh);
+}
+#endif
+
+void
+deletefuncs(shinstance *psh)
+{
+ struct tblentry **tblp;
+ struct tblentry **pp;
+ struct tblentry *cmdp;
+
+ INTOFF;
+ for (tblp = psh->cmdtable ; tblp < &psh->cmdtable[CMDTABLESIZE] ; tblp++) {
+ pp = tblp;
+ while ((cmdp = *pp) != NULL) {
+ if (cmdp->cmdtype == CMDFUNCTION) {
+ *pp = cmdp->next;
+ freefunc(psh, cmdp->param.func);
+ ckfree(psh, cmdp);
+ } else {
+ pp = &cmdp->next;
+ }
+ }
+ }
+ INTON;
+}
+
+
+
+/*
+ * Locate a command in the command hash table. If "add" is nonzero,
+ * add the command to the table if it is not already present. The
+ * variable "lastcmdentry" is set to point to the address of the link
+ * pointing to the entry, so that delete_cmd_entry can delete the
+ * entry.
+ */
+
+struct tblentry **lastcmdentry;
+
+
+STATIC struct tblentry *
+cmdlookup(shinstance *psh, const char *name, int add)
+{
+ int hashval;
+ const char *p;
+ struct tblentry *cmdp;
+ struct tblentry **pp;
+
+ p = name;
+ hashval = *p << 4;
+ while (*p)
+ hashval += *p++;
+ hashval &= 0x7FFF;
+ pp = &psh->cmdtable[hashval % CMDTABLESIZE];
+ for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
+ if (equal(cmdp->cmdname, name))
+ break;
+ pp = &cmdp->next;
+ }
+ if (add && cmdp == NULL) {
+ INTOFF;
+ cmdp = *pp = ckmalloc(psh, sizeof (struct tblentry) - ARB
+ + strlen(name) + 1);
+ cmdp->next = NULL;
+ cmdp->cmdtype = CMDUNKNOWN;
+ cmdp->rehash = 0;
+ cmdp->param.n.index = 0;
+ cmdp->param.n.suffix = 0;
+ strcpy(cmdp->cmdname, name);
+ INTON;
+ }
+ lastcmdentry = pp;
+ return cmdp;
+}
+
+/*
+ * Delete the command entry returned on the last lookup.
+ */
+
+STATIC void
+delete_cmd_entry(shinstance *psh)
+{
+ struct tblentry *cmdp;
+
+ INTOFF;
+ cmdp = *lastcmdentry;
+ *lastcmdentry = cmdp->next;
+ ckfree(psh, cmdp);
+ INTON;
+}
+
+
+
+#ifdef notdef
+void
+getcmdentry(shinstance *psh, char *name, struct cmdentry *entry)
+{
+ struct tblentry *cmdp = cmdlookup(psh, name, 0);
+
+ if (cmdp) {
+ entry->u = cmdp->param;
+ entry->cmdtype = cmdp->cmdtype;
+ } else {
+ entry->cmdtype = CMDUNKNOWN;
+ entry->u.index = 0;
+ }
+}
+#endif
+
+
+/*
+ * Add a new command entry, replacing any existing command entry for
+ * the same name - except special builtins.
+ */
+
+STATIC void
+addcmdentry(shinstance *psh, char *name, struct cmdentry *entry)
+{
+ struct tblentry *cmdp;
+
+ INTOFF;
+ cmdp = cmdlookup(psh, name, 1);
+ if (cmdp->cmdtype != CMDSPLBLTIN) {
+ if (cmdp->cmdtype == CMDFUNCTION) {
+ freefunc(psh, cmdp->param.func);
+ }
+ cmdp->cmdtype = entry->cmdtype;
+ cmdp->param = entry->u;
+ }
+ INTON;
+}
+
+
+/*
+ * Define a shell function.
+ */
+
+void
+defun(shinstance *psh, char *name, union node *func)
+{
+ struct cmdentry entry;
+
+ INTOFF;
+ entry.cmdtype = CMDFUNCTION;
+ entry.u.func = copyfunc(psh, func);
+ addcmdentry(psh, name, &entry);
+ INTON;
+}
+
+
+/*
+ * Delete a function if it exists.
+ */
+
+int
+unsetfunc(shinstance *psh, char *name)
+{
+ struct tblentry *cmdp;
+
+ if ((cmdp = cmdlookup(psh, name, 0)) != NULL &&
+ cmdp->cmdtype == CMDFUNCTION) {
+ freefunc(psh, cmdp->param.func);
+ delete_cmd_entry(psh);
+ return (0);
+ }
+ return (1);
+}
+
+/*
+ * Locate and print what a word is...
+ * also used for 'command -[v|V]'
+ */
+
+int
+typecmd(shinstance *psh, int argc, char **argv)
+{
+ struct cmdentry entry;
+ struct tblentry *cmdp;
+ char * const *pp;
+ struct alias *ap;
+ int err = 0;
+ char *arg;
+ int c;
+ int V_flag = 0;
+ int v_flag = 0;
+ int p_flag = 0;
+
+ while ((c = nextopt(psh, "vVp")) != 0) {
+ switch (c) {
+ case 'v': v_flag = 1; break;
+ case 'V': V_flag = 1; break;
+ case 'p': p_flag = 1; break;
+ }
+ }
+
+ if (p_flag && (v_flag || V_flag))
+ error(psh, "cannot specify -p with -v or -V");
+
+ while ((arg = *psh->argptr++)) {
+ if (!v_flag)
+ out1str(psh, arg);
+ /* First look at the keywords */
+ for (pp = parsekwd; *pp; pp++)
+ if (**pp == *arg && equal(*pp, arg))
+ break;
+
+ if (*pp) {
+ if (v_flag)
+ err = 1;
+ else
+ out1str(psh, " is a shell keyword\n");
+ continue;
+ }
+
+ /* Then look at the aliases */
+ if ((ap = lookupalias(psh, arg, 1)) != NULL) {
+ if (!v_flag)
+ out1fmt(psh, " is an alias for \n");
+ out1fmt(psh, "%s\n", ap->val);
+ continue;
+ }
+
+ /* Then check if it is a tracked alias */
+ if ((cmdp = cmdlookup(psh, arg, 0)) != NULL) {
+ entry.cmdtype = cmdp->cmdtype;
+ entry.u = cmdp->param;
+ } else {
+ /* Finally use brute force */
+ find_command(psh, arg, &entry, DO_ABS, pathval(psh));
+ }
+
+ switch (entry.cmdtype) {
+ case CMDNORMAL: {
+ if (!haspath(arg)) {
+ const char *path = pathval(psh);
+ char *name;
+ int j = entry.u.n.index;
+ do {
+ name = padvance(psh, &path, arg);
+ stunalloc(psh, name);
+ } while (--j >= 0);
+ if (!v_flag)
+ out1fmt(psh, " is%s ",
+ cmdp ? " a tracked alias for" : "");
+#ifdef PC_EXE_EXTS
+ if ((unsigned)entry.u.n.suffix < K_ELEMENTS(g_exe_suffixes))
+ out1fmt(psh, "%s%s\n", name, g_exe_suffixes[entry.u.n.suffix]);
+ else
+#endif
+ out1fmt(psh, "%s\n", name);
+ } else {
+ if (shfile_access(&psh->fdtab, arg, X_OK) == 0) {
+ if (!v_flag)
+ out1fmt(psh, " is ");
+ out1fmt(psh, "%s\n", arg);
+ } else {
+ if (!v_flag)
+ out1fmt(psh, ": %s\n",
+ sh_strerror(psh, errno));
+ else
+ err = 126;
+ }
+ }
+ break;
+ }
+ case CMDFUNCTION:
+ if (!v_flag)
+ out1str(psh, " is a shell function\n");
+ else
+ out1fmt(psh, "%s\n", arg);
+ break;
+
+ case CMDBUILTIN:
+ if (!v_flag)
+ out1str(psh, " is a shell builtin\n");
+ else
+ out1fmt(psh, "%s\n", arg);
+ break;
+
+ case CMDSPLBLTIN:
+ if (!v_flag)
+ out1str(psh, " is a special shell builtin\n");
+ else
+ out1fmt(psh, "%s\n", arg);
+ break;
+
+ default:
+ if (!v_flag)
+ out1str(psh, ": not found\n");
+ err = 127;
+ break;
+ }
+ }
+ return err;
+}