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Diffstat (limited to '')
| -rw-r--r-- | src/kash/exec.c | 1352 |
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; +} |