diff options
| -rw-r--r-- | shell/ash.c | 965 |
1 files changed, 441 insertions, 524 deletions
diff --git a/shell/ash.c b/shell/ash.c index e061211..9433336 100644 --- a/shell/ash.c +++ b/shell/ash.c @@ -407,6 +407,7 @@ out2str(const char *p) /* ============ Parsing structures */ + #define NCMD 0 #define NPIPE 1 #define NREDIR 2 @@ -896,12 +897,7 @@ struct strlist { }; #if ENABLE_ASH_ALIAS -#define ALIASINUSE 1 -#define ALIASDEAD 2 struct alias; -static int aliascmd(int, char **); -static int unaliascmd(int, char **); -static void printalias(const struct alias *); #endif struct strpush { @@ -1485,7 +1481,7 @@ nextopt(const char *optstring) } -/* ============ Variables */ +/* ============ Shell variables */ /* flags */ #define VEXPORT 0x01 /* variable is exported */ @@ -1503,11 +1499,6 @@ nextopt(const char *optstring) # define VDYNAMIC 0 #endif -#if ENABLE_LOCALE_SUPPORT -static void change_lc_all(const char *value); -static void change_lc_ctype(const char *value); -#endif - static const char defpathvar[] = "PATH=/usr/local/bin:/usr/bin:/sbin:/bin"; #ifdef IFS_BROKEN static const char defifsvar[] = "IFS= \t\n"; @@ -1516,6 +1507,27 @@ static const char defifsvar[] = "IFS= \t\n"; static const char defifs[] = " \t\n"; #endif +struct shparam { + int nparam; /* # of positional parameters (without $0) */ + unsigned char malloc; /* if parameter list dynamically allocated */ + char **p; /* parameter list */ +#if ENABLE_ASH_GETOPTS + int optind; /* next parameter to be processed by getopts */ + int optoff; /* used by getopts */ +#endif +}; + +static struct shparam shellparam; /* $@ current positional parameters */ + +#if ENABLE_ASH_GETOPTS +static void +getoptsreset(const char *value) +{ + shellparam.optind = number(value); + shellparam.optoff = -1; +} +#endif + struct var { struct var *next; /* next entry in hash list */ int flags; /* flags are defined above */ @@ -1532,46 +1544,45 @@ struct localvar { }; /* Forward decls for varinit[] */ +#if ENABLE_LOCALE_SUPPORT +static void change_lc_all(const char *value); +static void change_lc_ctype(const char *value); +#endif #if ENABLE_ASH_MAIL static void chkmail(void); static void changemail(const char *); #endif static void changepath(const char *); -#if ENABLE_ASH_GETOPTS -static void getoptsreset(const char *); -#endif #if ENABLE_ASH_RANDOM_SUPPORT static void change_random(const char *); #endif static struct var varinit[] = { #ifdef IFS_BROKEN - { 0, VSTRFIXED|VTEXTFIXED, defifsvar, 0 }, + { NULL, VSTRFIXED|VTEXTFIXED, defifsvar, NULL }, #else - { 0, VSTRFIXED|VTEXTFIXED|VUNSET, "IFS\0", 0 }, + { NULL, VSTRFIXED|VTEXTFIXED|VUNSET, "IFS\0", NULL }, #endif - #if ENABLE_ASH_MAIL - { 0, VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL\0", changemail }, - { 0, VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH\0", changemail }, + { NULL, VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL\0", changemail }, + { NULL, VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH\0", changemail }, #endif - - { 0, VSTRFIXED|VTEXTFIXED, defpathvar, changepath }, - { 0, VSTRFIXED|VTEXTFIXED, "PS1=$ ", 0 }, - { 0, VSTRFIXED|VTEXTFIXED, "PS2=> ", 0 }, - { 0, VSTRFIXED|VTEXTFIXED, "PS4=+ ", 0 }, + { NULL, VSTRFIXED|VTEXTFIXED, defpathvar, changepath }, + { NULL, VSTRFIXED|VTEXTFIXED, "PS1=$ ", NULL }, + { NULL, VSTRFIXED|VTEXTFIXED, "PS2=> ", NULL }, + { NULL, VSTRFIXED|VTEXTFIXED, "PS4=+ ", NULL }, #if ENABLE_ASH_GETOPTS - { 0, VSTRFIXED|VTEXTFIXED, "OPTIND=1", getoptsreset }, + { NULL, VSTRFIXED|VTEXTFIXED, "OPTIND=1", getoptsreset }, #endif #if ENABLE_ASH_RANDOM_SUPPORT - {0, VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "RANDOM\0", change_random }, + { NULL, VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "RANDOM\0", change_random }, #endif #if ENABLE_LOCALE_SUPPORT - {0, VSTRFIXED | VTEXTFIXED | VUNSET, "LC_ALL\0", change_lc_all }, - {0, VSTRFIXED | VTEXTFIXED | VUNSET, "LC_CTYPE\0", change_lc_ctype }, + { NULL, VSTRFIXED | VTEXTFIXED | VUNSET, "LC_ALL\0", change_lc_all }, + { NULL, VSTRFIXED | VTEXTFIXED | VUNSET, "LC_CTYPE\0", change_lc_ctype }, #endif #if ENABLE_FEATURE_EDITING_SAVEHISTORY - {0, VSTRFIXED | VTEXTFIXED | VUNSET, "HISTFILE\0", NULL }, + { NULL, VSTRFIXED | VTEXTFIXED | VUNSET, "HISTFILE\0", NULL }, #endif }; @@ -1611,10 +1622,6 @@ static struct var varinit[] = { #define mpathset() ((vmpath.flags & VUNSET) == 0) -static struct var **hashvar(const char *); - -static int loopnest; /* current loop nesting level */ - /* * The parsefile structure pointed to by the global variable parsefile * contains information about the current file being read. @@ -1627,36 +1634,13 @@ struct redirtab { static struct redirtab *redirlist; static int nullredirs; - extern char **environ; - static int preverrout_fd; /* save fd2 before print debug if xflag is set. */ -struct shparam { - int nparam; /* # of positional parameters (without $0) */ - unsigned char malloc; /* if parameter list dynamically allocated */ - char **p; /* parameter list */ -#if ENABLE_ASH_GETOPTS - int optind; /* next parameter to be processed by getopts */ - int optoff; /* used by getopts */ -#endif -}; - -static struct shparam shellparam; /* $@ current positional parameters */ - #define VTABSIZE 39 static struct var *vartab[VTABSIZE]; -#if ENABLE_ASH_GETOPTS -static void -getoptsreset(const char *value) -{ - shellparam.optind = number(value); - shellparam.optoff = -1; -} -#endif - #define is_name(c) ((c) == '_' || isalpha((unsigned char)(c))) #define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c))) @@ -2397,6 +2381,7 @@ static int casematch(union node *, char *); static void expari(int); #endif + /* parser.h */ /* control characters in argument strings */ @@ -2452,7 +2437,6 @@ static char *parsenextc; /* copy of parsefile->nextc */ #define basebuf bb_common_bufsiz1 /* buffer for top level input file */ - static int tokpushback; /* last token pushed back */ #define NEOF ((union node *)&tokpushback) static int parsebackquote; /* nonzero if we are inside backquotes */ @@ -2465,7 +2449,7 @@ static struct heredoc *heredoc; static int quoteflag; /* set if (part of) last token was quoted */ static void fixredir(union node *, const char *, int); -static char *endofname(const char *); + /* shell.h */ @@ -2478,7 +2462,6 @@ static const char dolatstr[] = { CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0' }; #define xlikely(x) __builtin_expect((x),1) - #define TEOF 0 #define TNL 1 #define TREDIR 2 @@ -2610,12 +2593,6 @@ findkwd(const char *s) ( (((unsigned int)c) - 33 < 32) \ && ((0xc1ff920dUL >> (((unsigned int)c) - 33)) & 1)) -#define digit_val(c) ((c) - '0') - -/* - * This file was generated by the mksyntax program. - */ - #if ENABLE_ASH_OPTIMIZE_FOR_SIZE #define USE_SIT_FUNCTION #endif @@ -3019,15 +2996,15 @@ static const char syntax_index_table[258] = { #endif /* USE_SIT_FUNCTION */ -/* alias.c */ +/* alias.c */ #define ATABSIZE 39 -static int funcblocksize; /* size of structures in function */ -static int funcstringsize; /* size of strings in node */ -static void *funcblock; /* block to allocate function from */ -static char *funcstring; /* block to allocate strings from */ +static int funcblocksize; /* size of structures in function */ +static int funcstringsize; /* size of strings in node */ +static void *funcblock; /* block to allocate function from */ +static char *funcstring; /* block to allocate strings from */ static const short nodesize[26] = { SHELL_ALIGN(sizeof(struct ncmd)), @@ -3058,14 +3035,12 @@ static const short nodesize[26] = { SHELL_ALIGN(sizeof(struct nnot)), }; - static void calcsize(union node *); static void sizenodelist(struct nodelist *); static union node *copynode(union node *); static struct nodelist *copynodelist(struct nodelist *); static char *nodeckstrdup(char *); - static int evalskip; /* set if we are skipping commands */ static int skipcount; /* number of levels to skip */ static int funcnest; /* depth of function calls */ @@ -3077,60 +3052,6 @@ static int funcnest; /* depth of function calls */ #define SKIPFILE (1 << 3) #define SKIPEVAL (1 << 4) -/* - * This file was generated by the mkbuiltins program. - */ - -#if JOBS -static int fg_bgcmd(int, char **); -#endif -static int breakcmd(int, char **); -static int cdcmd(int, char **); -#if ENABLE_ASH_CMDCMD -static int commandcmd(int, char **); -#endif -static int dotcmd(int, char **); -static int evalcmd(int, char **); -#if ENABLE_ASH_BUILTIN_ECHO -static int echocmd(int, char **); -#endif -#if ENABLE_ASH_BUILTIN_TEST -static int testcmd(int, char **); -#endif -static int execcmd(int, char **); -static int exitcmd(int, char **); -static int exportcmd(int, char **); -static int falsecmd(int, char **); -#if ENABLE_ASH_GETOPTS -static int getoptscmd(int, char **); -#endif -static int hashcmd(int, char **); -#if !ENABLE_FEATURE_SH_EXTRA_QUIET -static int helpcmd(int argc, char **argv); -#endif -#if JOBS -static int jobscmd(int, char **); -#endif -#if ENABLE_ASH_MATH_SUPPORT -static int letcmd(int, char **); -#endif -static int localcmd(int, char **); -static int pwdcmd(int, char **); -static int readcmd(int, char **); -static int returncmd(int, char **); -static int setcmd(int, char **); -static int shiftcmd(int, char **); -static int timescmd(int, char **); -static int trapcmd(int, char **); -static int truecmd(int, char **); -static int typecmd(int, char **); -static int umaskcmd(int, char **); -static int unsetcmd(int, char **); -static int waitcmd(int, char **); -static int ulimitcmd(int, char **); -#if JOBS -static int killcmd(int, char **); -#endif /* exec.h */ @@ -3189,30 +3110,9 @@ static unsigned long rseed; # endif #endif -/* PEOF (the end of file marker) */ - -enum { - INPUT_PUSH_FILE = 1, - INPUT_NOFILE_OK = 2, -}; - -/* - * The input line number. Input.c just defines this variable, and saves - * and restores it when files are pushed and popped. The user of this - * package must set its value. - */ -static void pungetc(void); -static void pushstring(char *, void *); -static void popstring(void); -static void setinputfd(int, int); -static void setinputstring(char *); -static void popfile(void); -static void popallfiles(void); -static void closescript(void); /* jobs.h */ - /* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */ #define FORK_FG 0 #define FORK_BG 1 @@ -3286,7 +3186,6 @@ static void readcmdfile(char *); static char *minusc; /* argument to -c option */ - static void optschanged(void); static void setparam(char **); static void freeparam(volatile struct shparam *); @@ -3350,7 +3249,12 @@ static int is_safe_applet(char *name) } +/* ============ Alias handling */ #if ENABLE_ASH_ALIAS + +#define ALIASINUSE 1 +#define ALIASDEAD 2 + struct alias { struct alias *next; char *name; @@ -3475,6 +3379,12 @@ rmaliases(void) INT_ON; } +static void +printalias(const struct alias *ap) +{ + out1fmt("%s=%s\n", ap->name, single_quote(ap->val)); +} + /* * TODO - sort output */ @@ -3532,25 +3442,17 @@ unaliascmd(int argc, char **argv) return i; } - -static void -printalias(const struct alias *ap) -{ - out1fmt("%s=%s\n", ap->name, single_quote(ap->val)); -} #endif /* ASH_ALIAS */ -/* eval.c */ -/* - * Evaluate a command. - */ +/* ============ eval.c */ /* flags in argument to evaltree */ #define EV_EXIT 01 /* exit after evaluating tree */ #define EV_TESTED 02 /* exit status is checked; ignore -e flag */ #define EV_BACKCMD 04 /* command executing within back quotes */ +/* forward declarations - evaluation is faily recursive business... */ static void evalloop(union node *, int); static void evalfor(union node *, int); static void evalcase(union node *, int); @@ -3679,12 +3581,12 @@ evaltree(union node *n, int flags) } } - #if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3) static #endif void evaltreenr(union node *, int) __attribute__ ((alias("evaltree"),__noreturn__)); +static int loopnest; /* current loop nesting level */ static void evalloop(union node *n, int flags) @@ -3722,7 +3624,6 @@ evalloop(union node *n, int flags) exitstatus = status; } - static void evalfor(union node *n, int flags) { @@ -3762,7 +3663,6 @@ evalfor(union node *n, int flags) popstackmark(&smark); } - static void evalcase(union node *n, int flags) { @@ -3789,7 +3689,6 @@ evalcase(union node *n, int flags) popstackmark(&smark); } - /* * Kick off a subshell to evaluate a tree. */ @@ -3822,7 +3721,6 @@ evalsubshell(union node *n, int flags) INT_ON; } - /* * Compute the names of the files in a redirection list. */ @@ -3858,7 +3756,6 @@ expredir(union node *n) } } - /* * Evaluate a pipeline. All the processes in the pipeline are children * of the process creating the pipeline. (This differs from some versions @@ -3919,7 +3816,6 @@ evalpipe(union node *n, int flags) INT_ON; } - #if ENABLE_ASH_CMDCMD static char ** parse_command_args(char **argv, const char **path) @@ -3955,6 +3851,57 @@ parse_command_args(char **argv, const char **path) } #endif +/* Forward declarations for builtintab[] */ +#if JOBS +static int fg_bgcmd(int, char **); +#endif +static int breakcmd(int, char **); +#if ENABLE_ASH_CMDCMD +static int commandcmd(int, char **); +#endif +static int dotcmd(int, char **); +static int evalcmd(int, char **); +#if ENABLE_ASH_BUILTIN_ECHO +static int echocmd(int, char **); +#endif +#if ENABLE_ASH_BUILTIN_TEST +static int testcmd(int, char **); +#endif +static int execcmd(int, char **); +static int exitcmd(int, char **); +static int exportcmd(int, char **); +static int falsecmd(int, char **); +#if ENABLE_ASH_GETOPTS +static int getoptscmd(int, char **); +#endif +static int hashcmd(int, char **); +#if !ENABLE_FEATURE_SH_EXTRA_QUIET +static int helpcmd(int argc, char **argv); +#endif +#if JOBS +static int jobscmd(int, char **); +#endif +#if ENABLE_ASH_MATH_SUPPORT +static int letcmd(int, char **); +#endif +static int localcmd(int, char **); +static int pwdcmd(int, char **); +static int readcmd(int, char **); +static int returncmd(int, char **); +static int setcmd(int, char **); +static int shiftcmd(int, char **); +static int timescmd(int, char **); +static int trapcmd(int, char **); +static int truecmd(int, char **); +static int typecmd(int, char **); +static int umaskcmd(int, char **); +static int unsetcmd(int, char **); +static int waitcmd(int, char **); +static int ulimitcmd(int, char **); +#if JOBS +static int killcmd(int, char **); +#endif + #define BUILTIN_NOSPEC "0" #define BUILTIN_SPECIAL "1" #define BUILTIN_REGULAR "2" @@ -4514,7 +4461,7 @@ execcmd(int argc, char **argv) } -/* exec.c */ +/* ============ Executing commands */ /* * When commands are first encountered, they are entered in a hash table. @@ -4528,7 +4475,6 @@ execcmd(int argc, char **argv) #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 */ @@ -4537,72 +4483,9 @@ struct tblentry { char cmdname[ARB]; /* name of command */ }; - static struct tblentry *cmdtable[CMDTABLESIZE]; static int builtinloc = -1; /* index in path of %builtin, or -1 */ - -static void tryexec(char *, char **, char **); -static void clearcmdentry(int); -static struct tblentry *cmdlookup(const char *, int); -static void delete_cmd_entry(void); - - -/* - * Exec a program. Never returns. If you change this routine, you may - * have to change the find_command routine as well. - */ -#define environment() listvars(VEXPORT, VUNSET, 0) -static void shellexec(char **, const char *, int) ATTRIBUTE_NORETURN; -static void -shellexec(char **argv, const char *path, int idx) -{ - char *cmdname; - int e; - char **envp; - int exerrno; - - clearredir(1); - envp = environment(); - if (strchr(argv[0], '/') || is_safe_applet(argv[0]) -#if ENABLE_FEATURE_SH_STANDALONE_SHELL - || find_applet_by_name(argv[0]) -#endif - ) { - tryexec(argv[0], argv, envp); - e = errno; - } else { - e = ENOENT; - while ((cmdname = padvance(&path, argv[0])) != NULL) { - if (--idx < 0 && pathopt == NULL) { - tryexec(cmdname, argv, envp); - if (errno != ENOENT && errno != ENOTDIR) - e = errno; - } - stunalloc(cmdname); - } - } - - /* Map to POSIX errors */ - switch (e) { - case EACCES: - exerrno = 126; - break; - case ENOENT: - exerrno = 127; - break; - default: - exerrno = 2; - break; - } - exitstatus = exerrno; - TRACE(("shellexec failed for %s, errno %d, suppressint %d\n", - argv[0], e, suppressint )); - ash_msg_and_raise(EXEXEC, "%s: %s", argv[0], errmsg(e, "not found")); - /* NOTREACHED */ -} - - static void tryexec(char *cmd, char **argv, char **envp) { @@ -4659,8 +4542,59 @@ tryexec(char *cmd, char **argv, char **envp) } } +/* + * Exec a program. Never returns. If you change this routine, you may + * have to change the find_command routine as well. + */ +#define environment() listvars(VEXPORT, VUNSET, 0) +static void shellexec(char **, const char *, int) ATTRIBUTE_NORETURN; +static void +shellexec(char **argv, const char *path, int idx) +{ + char *cmdname; + int e; + char **envp; + int exerrno; + + clearredir(1); + envp = environment(); + if (strchr(argv[0], '/') || is_safe_applet(argv[0]) +#if ENABLE_FEATURE_SH_STANDALONE_SHELL + || find_applet_by_name(argv[0]) +#endif + ) { + tryexec(argv[0], argv, envp); + e = errno; + } else { + e = ENOENT; + while ((cmdname = padvance(&path, argv[0])) != NULL) { + if (--idx < 0 && pathopt == NULL) { + tryexec(cmdname, argv, envp); + if (errno != ENOENT && errno != ENOTDIR) + e = errno; + } + stunalloc(cmdname); + } + } -/*** Command hashing code ***/ + /* Map to POSIX errors */ + switch (e) { + case EACCES: + exerrno = 126; + break; + case ENOENT: + exerrno = 127; + break; + default: + exerrno = 2; + break; + } + exitstatus = exerrno; + TRACE(("shellexec failed for %s, errno %d, suppressint %d\n", + argv[0], e, suppressint )); + ash_msg_and_raise(EXEXEC, "%s: %s", argv[0], errmsg(e, "not found")); + /* NOTREACHED */ +} static void printentry(struct tblentry *cmdp) @@ -4678,6 +4612,111 @@ printentry(struct tblentry *cmdp) out1fmt("%s%s\n", name, (cmdp->rehash ? "*" : nullstr)); } +/* + * Clear out command entries. The argument specifies the first entry in + * PATH which has changed. + */ +static void +clearcmdentry(int firstchange) +{ + struct tblentry **tblp; + struct tblentry **pp; + struct tblentry *cmdp; + + INT_OFF; + for (tblp = cmdtable; tblp < &cmdtable[CMDTABLESIZE]; tblp++) { + pp = tblp; + while ((cmdp = *pp) != NULL) { + if ((cmdp->cmdtype == CMDNORMAL && + cmdp->param.index >= firstchange) + || (cmdp->cmdtype == CMDBUILTIN && + builtinloc >= firstchange) + ) { + *pp = cmdp->next; + free(cmdp); + } else { + pp = &cmdp->next; + } + } + } + INT_ON; +} + +/* + * 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. + * + * Interrupts must be off if called with add != 0. + */ +static struct tblentry **lastcmdentry; + +static struct tblentry * +cmdlookup(const char *name, int add) +{ + unsigned int hashval; + const char *p; + struct tblentry *cmdp; + struct tblentry **pp; + + p = name; + hashval = (unsigned char)*p << 4; + while (*p) + hashval += (unsigned char)*p++; + hashval &= 0x7FFF; + pp = &cmdtable[hashval % CMDTABLESIZE]; + for (cmdp = *pp; cmdp; cmdp = cmdp->next) { + if (strcmp(cmdp->cmdname, name) == 0) + break; + pp = &cmdp->next; + } + if (add && cmdp == NULL) { + cmdp = *pp = ckmalloc(sizeof(struct tblentry) - ARB + + strlen(name) + 1); + cmdp->next = NULL; + cmdp->cmdtype = CMDUNKNOWN; + strcpy(cmdp->cmdname, name); + } + lastcmdentry = pp; + return cmdp; +} + +/* + * Delete the command entry returned on the last lookup. + */ +static void +delete_cmd_entry(void) +{ + struct tblentry *cmdp; + + INT_OFF; + cmdp = *lastcmdentry; + *lastcmdentry = cmdp->next; + if (cmdp->cmdtype == CMDFUNCTION) + freefunc(cmdp->param.func); + free(cmdp); + INT_ON; +} + +/* + * Add a new command entry, replacing any existing command entry for + * the same name - except special builtins. + */ +static void +addcmdentry(char *name, struct cmdentry *entry) +{ + struct tblentry *cmdp; + + cmdp = cmdlookup(name, 1); + if (cmdp->cmdtype == CMDFUNCTION) { + freefunc(cmdp->param.func); + } + cmdp->cmdtype = entry->cmdtype; + cmdp->param = entry->u; + cmdp->rehash = 0; +} static int hashcmd(int argc, char **argv) @@ -4716,7 +4755,6 @@ hashcmd(int argc, char **argv) return c; } - /* * Resolve a command name. If you change this routine, you may have to * change the shellexec routine as well. @@ -4901,7 +4939,6 @@ find_command(char *name, struct cmdentry *entry, int act, const char *path) entry->u = cmdp->param; } - /* * Search the table of builtin commands. */ @@ -4917,7 +4954,6 @@ find_builtin(const char *name) return bp; } - /* * Called when a cd is done. Marks all commands so the next time they * are executed they will be rehashed. @@ -4940,7 +4976,6 @@ hashcd(void) } } - /* * Fix command hash table when PATH changed. * Called before PATH is changed. The argument is the new value of PATH; @@ -4987,116 +5022,6 @@ changepath(const char *newval) /* - * Clear out command entries. The argument specifies the first entry in - * PATH which has changed. - */ -static void -clearcmdentry(int firstchange) -{ - struct tblentry **tblp; - struct tblentry **pp; - struct tblentry *cmdp; - - INT_OFF; - for (tblp = cmdtable; tblp < &cmdtable[CMDTABLESIZE]; tblp++) { - pp = tblp; - while ((cmdp = *pp) != NULL) { - if ((cmdp->cmdtype == CMDNORMAL && - cmdp->param.index >= firstchange) - || (cmdp->cmdtype == CMDBUILTIN && - builtinloc >= firstchange) - ) { - *pp = cmdp->next; - free(cmdp); - } else { - pp = &cmdp->next; - } - } - } - INT_ON; -} - - -/* - * 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. - * - * Interrupts must be off if called with add != 0. - */ -static struct tblentry **lastcmdentry; - -static struct tblentry * -cmdlookup(const char *name, int add) -{ - unsigned int hashval; - const char *p; - struct tblentry *cmdp; - struct tblentry **pp; - - p = name; - hashval = (unsigned char)*p << 4; - while (*p) - hashval += (unsigned char)*p++; - hashval &= 0x7FFF; - pp = &cmdtable[hashval % CMDTABLESIZE]; - for (cmdp = *pp; cmdp; cmdp = cmdp->next) { - if (strcmp(cmdp->cmdname, name) == 0) - break; - pp = &cmdp->next; - } - if (add && cmdp == NULL) { - cmdp = *pp = ckmalloc(sizeof(struct tblentry) - ARB - + strlen(name) + 1); - cmdp->next = NULL; - cmdp->cmdtype = CMDUNKNOWN; - strcpy(cmdp->cmdname, name); - } - lastcmdentry = pp; - return cmdp; -} - - -/* - * Delete the command entry returned on the last lookup. - */ -static void -delete_cmd_entry(void) -{ - struct tblentry *cmdp; - - INT_OFF; - cmdp = *lastcmdentry; - *lastcmdentry = cmdp->next; - if (cmdp->cmdtype == CMDFUNCTION) - freefunc(cmdp->param.func); - free(cmdp); - INT_ON; -} - - -/* - * Add a new command entry, replacing any existing command entry for - * the same name - except special builtins. - */ -static void -addcmdentry(char *name, struct cmdentry *entry) -{ - struct tblentry *cmdp; - - cmdp = cmdlookup(name, 1); - if (cmdp->cmdtype == CMDFUNCTION) { - freefunc(cmdp->param.func); - } - cmdp->cmdtype = entry->cmdtype; - cmdp->param = entry->u; - cmdp->rehash = 0; -} - - -/* * Make a copy of a parse tree. */ static struct funcnode * @@ -5145,6 +5070,7 @@ unsetfunc(const char *name) delete_cmd_entry(); } + /* * Locate and print what a word is... */ @@ -6804,94 +6730,45 @@ varunset(const char *end, const char *var, const char *umsg, int varflags) } -/* input.c */ - -/* +/* ============ input.c + * * This implements the input routines used by the parser. */ - #define EOF_NLEFT -99 /* value of parsenleft when EOF pushed back */ -static void pushfile(void); - -/* - * Read a character from the script, returning PEOF on end of file. - * Nul characters in the input are silently discarded. - */ -static int preadbuffer(void); -#define pgetc_as_macro() (--parsenleft >= 0? SC2INT(*parsenextc++) : preadbuffer()) +enum { + INPUT_PUSH_FILE = 1, + INPUT_NOFILE_OK = 2, +}; -#if ENABLE_ASH_OPTIMIZE_FOR_SIZE -#define pgetc_macro() pgetc() -static int -pgetc(void) -{ - return pgetc_as_macro(); -} -#else -#define pgetc_macro() pgetc_as_macro() -static int -pgetc(void) +static void +popstring(void) { - return pgetc_macro(); -} -#endif + struct strpush *sp = parsefile->strpush; -/* - * Same as pgetc(), but ignores PEOA. - */ + INT_OFF; #if ENABLE_ASH_ALIAS -static int -pgetc2(void) -{ - int c; - - do { - c = pgetc_macro(); - } while (c == PEOA); - return c; -} -#else -static int -pgetc2(void) -{ - return pgetc_macro(); -} -#endif - -/* - * Read a line from the script. - */ -static char * -pfgets(char *line, int len) -{ - char *p = line; - int nleft = len; - int c; - - while (--nleft > 0) { - c = pgetc2(); - if (c == PEOF) { - if (p == line) - return NULL; - break; + if (sp->ap) { + if (parsenextc[-1] == ' ' || parsenextc[-1] == '\t') { + checkkwd |= CHKALIAS; + } + if (sp->string != sp->ap->val) { + free(sp->string); + } + sp->ap->flag &= ~ALIASINUSE; + if (sp->ap->flag & ALIASDEAD) { + unalias(sp->ap->name); } - *p++ = c; - if (c == '\n') - break; } - *p = '\0'; - return line; -} - -#if ENABLE_FEATURE_EDITING_VI -#define setvimode(on) do { \ - if (on) line_input_state->flags |= VI_MODE; \ - else line_input_state->flags &= ~VI_MODE; \ -} while (0) -#else -#define setvimode(on) viflag = 0 /* forcibly keep the option off */ #endif + parsenextc = sp->prevstring; + parsenleft = sp->prevnleft; +/*dprintf("*** calling popstring: restoring to '%s'\n", parsenextc);*/ + parsefile->strpush = sp->prev; + if (sp != &(parsefile->basestrpush)) + free(sp); + INT_ON; +} static int preadfd(void) @@ -7024,6 +6901,72 @@ preadbuffer(void) return SC2INT(*parsenextc++); } + +#define pgetc_as_macro() (--parsenleft >= 0? SC2INT(*parsenextc++) : preadbuffer()) + +#if ENABLE_ASH_OPTIMIZE_FOR_SIZE +#define pgetc_macro() pgetc() +static int +pgetc(void) +{ + return pgetc_as_macro(); +} +#else +#define pgetc_macro() pgetc_as_macro() +static int +pgetc(void) +{ + return pgetc_macro(); +} +#endif + +/* + * Same as pgetc(), but ignores PEOA. + */ +#if ENABLE_ASH_ALIAS +static int +pgetc2(void) +{ + int c; + + do { + c = pgetc_macro(); + } while (c == PEOA); + return c; +} +#else +static int +pgetc2(void) +{ + return pgetc_macro(); +} +#endif + +/* + * Read a line from the script. + */ +static char * +pfgets(char *line, int len) +{ + char *p = line; + int nleft = len; + int c; + + while (--nleft > 0) { + c = pgetc2(); + if (c == PEOF) { + if (p == line) + return NULL; + break; + } + *p++ = c; + if (c == '\n') + break; + } + *p = '\0'; + return line; +} + /* * Undo the last call to pgetc. Only one character may be pushed back. * PEOF may be pushed back. @@ -7068,103 +7011,6 @@ pushstring(char *s, void *ap) INT_ON; } -static void -popstring(void) -{ - struct strpush *sp = parsefile->strpush; - - INT_OFF; -#if ENABLE_ASH_ALIAS - if (sp->ap) { - if (parsenextc[-1] == ' ' || parsenextc[-1] == '\t') { - checkkwd |= CHKALIAS; - } - if (sp->string != sp->ap->val) { - free(sp->string); - } - sp->ap->flag &= ~ALIASINUSE; - if (sp->ap->flag & ALIASDEAD) { - unalias(sp->ap->name); - } - } -#endif - parsenextc = sp->prevstring; - parsenleft = sp->prevnleft; -/*dprintf("*** calling popstring: restoring to '%s'\n", parsenextc);*/ - parsefile->strpush = sp->prev; - if (sp != &(parsefile->basestrpush)) - free(sp); - INT_ON; -} - - -/* - * Set the input to take input from a file. If push is set, push the - * old input onto the stack first. - */ -static int -setinputfile(const char *fname, int flags) -{ - int fd; - int fd2; - - INT_OFF; - fd = open(fname, O_RDONLY); - if (fd < 0) { - if (flags & INPUT_NOFILE_OK) - goto out; - ash_msg_and_raise_error("Can't open %s", fname); - } - if (fd < 10) { - fd2 = copyfd(fd, 10); - close(fd); - if (fd2 < 0) - ash_msg_and_raise_error("Out of file descriptors"); - fd = fd2; - } - setinputfd(fd, flags & INPUT_PUSH_FILE); - out: - INT_ON; - return fd; -} - - -/* - * Like setinputfile, but takes an open file descriptor. Call this with - * interrupts off. - */ -static void -setinputfd(int fd, int push) -{ - (void) fcntl(fd, F_SETFD, FD_CLOEXEC); - if (push) { - pushfile(); - parsefile->buf = 0; - } - parsefile->fd = fd; - if (parsefile->buf == NULL) - parsefile->buf = ckmalloc(IBUFSIZ); - parselleft = parsenleft = 0; - plinno = 1; -} - - -/* - * Like setinputfile, but takes input from a string. - */ -static void -setinputstring(char *string) -{ - INT_OFF; - pushfile(); - parsenextc = string; - parsenleft = strlen(string); - parsefile->buf = NULL; - plinno = 1; - INT_ON; -} - - /* * 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. @@ -7186,7 +7032,6 @@ pushfile(void) parsefile = pf; } - static void popfile(void) { @@ -7208,7 +7053,6 @@ popfile(void) INT_ON; } - /* * Return to top level. */ @@ -7219,7 +7063,6 @@ popallfiles(void) popfile(); } - /* * Close the file(s) that the shell is reading commands from. Called * after a fork is done. @@ -7234,6 +7077,71 @@ closescript(void) } } +/* + * Like setinputfile, but takes an open file descriptor. Call this with + * interrupts off. + */ +static void +setinputfd(int fd, int push) +{ + fcntl(fd, F_SETFD, FD_CLOEXEC); + if (push) { + pushfile(); + parsefile->buf = 0; + } + parsefile->fd = fd; + if (parsefile->buf == NULL) + parsefile->buf = ckmalloc(IBUFSIZ); + parselleft = parsenleft = 0; + plinno = 1; +} + +/* + * Set the input to take input from a file. If push is set, push the + * old input onto the stack first. + */ +static int +setinputfile(const char *fname, int flags) +{ + int fd; + int fd2; + + INT_OFF; + fd = open(fname, O_RDONLY); + if (fd < 0) { + if (flags & INPUT_NOFILE_OK) + goto out; + ash_msg_and_raise_error("Can't open %s", fname); + } + if (fd < 10) { + fd2 = copyfd(fd, 10); + close(fd); + if (fd2 < 0) + ash_msg_and_raise_error("Out of file descriptors"); + fd = fd2; + } + setinputfd(fd, flags & INPUT_PUSH_FILE); + out: + INT_ON; + return fd; +} + +/* + * Like setinputfile, but takes input from a string. + */ +static void +setinputstring(char *string) +{ + INT_OFF; + pushfile(); + parsenextc = string; + parsenleft = strlen(string); + parsefile->buf = NULL; + plinno = 1; + INT_ON; +} + + /* jobs.c */ /* mode flags for set_curjob */ @@ -8903,6 +8811,15 @@ nodeckstrdup(char *s) } +#if ENABLE_FEATURE_EDITING_VI +#define setvimode(on) do { \ + if (on) line_input_state->flags |= VI_MODE; \ + else line_input_state->flags &= ~VI_MODE; \ +} while (0) +#else +#define setvimode(on) viflag = 0 /* forcibly keep the option off */ +#endif + static void optschanged(void) { @@ -9495,7 +9412,7 @@ fixredir(union node *n, const char *text, int err) n->ndup.vname = NULL; if (isdigit(text[0]) && text[1] == '\0') - n->ndup.dupfd = digit_val(text[0]); + n->ndup.dupfd = text[0] - '0'; else if (LONE_DASH(text)) n->ndup.dupfd = -1; else { @@ -10160,7 +10077,7 @@ parseredir: { } } if (fd != '\0') - np->nfile.fd = digit_val(fd); + np->nfile.fd = fd - '0'; redirnode = np; goto parseredir_return; } |