Some more hush.c updates from Larry Doolittle.
This commit is contained in:
Eric Andersen
parent
0e9aef36fa
commit
aac75e5a78
55
hush.c
55
hush.c
@ -45,14 +45,12 @@
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* fancy forms of Parameter Expansion
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* Arithmetic Expansion
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* <(list) and >(list) Process Substitution
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* reserved words: if, then, elif, else, fi, while, until, for,
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* do, done, case
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* reserved words: case, esac, function
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* Here Documents ( << word )
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* Functions
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* Major bugs:
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* job handling woefully incomplete and buggy
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* reserved word execution woefully incomplete and buggy
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* incomplete reserved word sequence doesn't request more lines of input
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* to-do:
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* port selected bugfixes from post-0.49 busybox lash
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* finish implementing reserved words
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@ -73,7 +71,6 @@
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* more testing, especially quoting rules and redirection
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* maybe change map[] to use 2-bit entries
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* (eventually) remove all the printf's
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* more integration with BusyBox: prompts, cmdedit, applets
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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@ -105,7 +102,7 @@
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#include <signal.h>
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/* #include <dmalloc.h> */
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/* #define DEBUG_SHELL */
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#define DEBUG_SHELL
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#ifdef BB_VER
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#include "busybox.h"
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@ -977,6 +974,42 @@ static void pseudo_exec(struct child_prog *child)
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exit(x->function(child));
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}
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}
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/* Check if the command matches any busybox internal commands
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* ("applets") here.
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* FIXME: This feature is not 100% safe, since
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* BusyBox is not fully reentrant, so we have no guarantee the things
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* from the .bss are still zeroed, or that things from .data are still
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* at their defaults. We could exec ourself from /proc/self/exe, but I
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* really dislike relying on /proc for things. We could exec ourself
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* from global_argv[0], but if we are in a chroot, we may not be able
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* to find ourself... */
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#ifdef BB_FEATURE_SH_STANDALONE_SHELL
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{
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int argc_l;
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char** argv_l=child->argv;
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char *name = child->argv[0];
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#ifdef BB_FEATURE_SH_APPLETS_ALWAYS_WIN
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/* Following discussions from November 2000 on the busybox mailing
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* list, the default configuration, (without
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* get_last_path_component()) lets the user force use of an
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* external command by specifying the full (with slashes) filename.
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* If you enable BB_FEATURE_SH_APPLETS_ALWAYS_WIN, then applets
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* _aways_ override external commands, so if you want to run
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* /bin/cat, it will use BusyBox cat even if /bin/cat exists on the
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* filesystem and is _not_ busybox. Some systems may want this,
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* most do not. */
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name = get_last_path_component(name);
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#endif
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/* Count argc for use in a second... */
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for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++);
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optind = 1;
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debug_printf("running applet %s\n", name);
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run_applet_by_name(name, argc_l, child->argv);
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exit(1);
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}
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#endif
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debug_printf("exec of %s\n",child->argv[0]);
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execvp(child->argv[0],child->argv);
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perror("execvp");
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@ -1842,14 +1875,13 @@ int parse_stream(o_string *dest, struct p_context *ctx,
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ch,ch,m,dest->quote);
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if (m==0 || ((m==1 || m==2) && dest->quote)) {
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b_addqchr(dest, ch, dest->quote);
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} else if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) {
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debug_printf("leaving parse_stream\n");
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return 0;
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} else if (m==2 && !dest->quote) { /* IFS */
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} else {
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if (m==2) { /* unquoted IFS */
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done_word(dest, ctx);
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if (ch=='\n') done_pipe(ctx,PIPE_SEQ);
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}
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if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) {
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debug_printf("leaving parse_stream (stupid duplication)\n");
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debug_printf("leaving parse_stream\n");
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return 0;
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}
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#if 0
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@ -1860,7 +1892,7 @@ int parse_stream(o_string *dest, struct p_context *ctx,
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initialize_context(ctx);
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}
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#endif
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} else switch (ch) {
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if (m!=2) switch (ch) {
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case '#':
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if (dest->length == 0 && !dest->quote) {
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while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); }
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@ -1964,6 +1996,7 @@ int parse_stream(o_string *dest, struct p_context *ctx,
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return 1;
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}
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}
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}
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/* complain if quote? No, maybe we just finished a command substitution
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* that was quoted. Example:
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* $ echo "`cat foo` plus more"
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55
shell/hush.c
55
shell/hush.c
@ -45,14 +45,12 @@
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* fancy forms of Parameter Expansion
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* Arithmetic Expansion
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* <(list) and >(list) Process Substitution
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* reserved words: if, then, elif, else, fi, while, until, for,
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* do, done, case
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* reserved words: case, esac, function
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* Here Documents ( << word )
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* Functions
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* Major bugs:
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* job handling woefully incomplete and buggy
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* reserved word execution woefully incomplete and buggy
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* incomplete reserved word sequence doesn't request more lines of input
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* to-do:
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* port selected bugfixes from post-0.49 busybox lash
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* finish implementing reserved words
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@ -73,7 +71,6 @@
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* more testing, especially quoting rules and redirection
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* maybe change map[] to use 2-bit entries
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* (eventually) remove all the printf's
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* more integration with BusyBox: prompts, cmdedit, applets
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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@ -105,7 +102,7 @@
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#include <signal.h>
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/* #include <dmalloc.h> */
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/* #define DEBUG_SHELL */
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#define DEBUG_SHELL
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#ifdef BB_VER
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#include "busybox.h"
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@ -977,6 +974,42 @@ static void pseudo_exec(struct child_prog *child)
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exit(x->function(child));
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}
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}
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/* Check if the command matches any busybox internal commands
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* ("applets") here.
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* FIXME: This feature is not 100% safe, since
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* BusyBox is not fully reentrant, so we have no guarantee the things
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* from the .bss are still zeroed, or that things from .data are still
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* at their defaults. We could exec ourself from /proc/self/exe, but I
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* really dislike relying on /proc for things. We could exec ourself
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* from global_argv[0], but if we are in a chroot, we may not be able
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* to find ourself... */
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#ifdef BB_FEATURE_SH_STANDALONE_SHELL
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{
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int argc_l;
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char** argv_l=child->argv;
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char *name = child->argv[0];
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#ifdef BB_FEATURE_SH_APPLETS_ALWAYS_WIN
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/* Following discussions from November 2000 on the busybox mailing
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* list, the default configuration, (without
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* get_last_path_component()) lets the user force use of an
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* external command by specifying the full (with slashes) filename.
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* If you enable BB_FEATURE_SH_APPLETS_ALWAYS_WIN, then applets
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* _aways_ override external commands, so if you want to run
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* /bin/cat, it will use BusyBox cat even if /bin/cat exists on the
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* filesystem and is _not_ busybox. Some systems may want this,
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* most do not. */
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name = get_last_path_component(name);
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#endif
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/* Count argc for use in a second... */
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for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++);
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optind = 1;
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debug_printf("running applet %s\n", name);
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run_applet_by_name(name, argc_l, child->argv);
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exit(1);
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}
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#endif
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debug_printf("exec of %s\n",child->argv[0]);
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execvp(child->argv[0],child->argv);
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perror("execvp");
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@ -1842,14 +1875,13 @@ int parse_stream(o_string *dest, struct p_context *ctx,
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ch,ch,m,dest->quote);
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if (m==0 || ((m==1 || m==2) && dest->quote)) {
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b_addqchr(dest, ch, dest->quote);
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} else if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) {
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debug_printf("leaving parse_stream\n");
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return 0;
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} else if (m==2 && !dest->quote) { /* IFS */
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} else {
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if (m==2) { /* unquoted IFS */
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done_word(dest, ctx);
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if (ch=='\n') done_pipe(ctx,PIPE_SEQ);
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}
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if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) {
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debug_printf("leaving parse_stream (stupid duplication)\n");
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debug_printf("leaving parse_stream\n");
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return 0;
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}
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#if 0
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@ -1860,7 +1892,7 @@ int parse_stream(o_string *dest, struct p_context *ctx,
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initialize_context(ctx);
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}
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#endif
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} else switch (ch) {
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if (m!=2) switch (ch) {
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case '#':
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if (dest->length == 0 && !dest->quote) {
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while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); }
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@ -1964,6 +1996,7 @@ int parse_stream(o_string *dest, struct p_context *ctx,
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return 1;
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}
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}
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}
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/* complain if quote? No, maybe we just finished a command substitution
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* that was quoted. Example:
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* $ echo "`cat foo` plus more"
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