This fixes lash so it handles environment variable expansion, regardless
of where the environment variables are located in an argument. This allows things like 'echo foo$1$SHELL' to expand the same way bash would expand it. Of course, to make this work I introduced a memory leak, and I am too tired to find a way to fix it. -Erik
This commit is contained in:
Eric Andersen
parent
a183f05825
commit
caeeb36784
47
lash.c
47
lash.c
@ -49,7 +49,6 @@
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//#define DEBUG_SHELL
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#include "busybox.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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@ -62,6 +61,7 @@
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#include <sys/wait.h>
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#include <unistd.h>
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#include <getopt.h>
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#include "busybox.h"
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#include "cmdedit.h"
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static const int MAX_LINE = 256; /* size of input buffer for cwd data */
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@ -916,44 +916,57 @@ static void expand_argument(struct child_prog *prog, int *argcPtr,
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flags = 0;
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i = 0;
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}
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/* do shell variable substitution */
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if(*prog->argv[argc_l - 1] == '$') {
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if ((var = getenv(prog->argv[argc_l - 1] + 1))) {
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prog->argv[argc_l - 1] = var;
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}
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#ifdef BB_FEATURE_SH_ENVIRONMENT
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else {
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switch(*(prog->argv[argc_l - 1] + 1)) {
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/* do shell variable substitution */
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src = prog->argv[argc_l - 1];
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while((dst = strchr(src,'$')) != NULL){
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if (!(var = getenv(dst + 1))) {
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switch(*(dst+1)) {
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case '?':
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prog->argv[argc_l - 1] = itoa(last_return_code);
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var = itoa(last_return_code);
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break;
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case '$':
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prog->argv[argc_l - 1] = itoa(getpid());
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var = itoa(getpid());
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break;
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case '#':
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prog->argv[argc_l - 1] = itoa(argc-1);
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var = itoa(argc-1);
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break;
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case '!':
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if (last_bg_pid==-1)
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*(prog->argv[argc_l - 1])='\0';
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*(var)='\0';
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else
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prog->argv[argc_l - 1] = itoa(last_bg_pid);
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var = itoa(last_bg_pid);
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break;
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case '0':case '1':case '2':case '3':case '4':
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case '5':case '6':case '7':case '8':case '9':
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{
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int index=*(prog->argv[argc_l - 1] + 1)-48;
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int index=*(dst + 1)-48;
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if (index >= argc) {
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*(prog->argv[argc_l - 1])='\0';
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var='\0';
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} else {
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prog->argv[argc_l - 1] = argv[index];
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var = argv[index];
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}
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}
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break;
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}
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}
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#endif
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if (var) {
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int offset = dst-src;
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#warning I have a memory leak which needs to be plugged somehow
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src = (char*)xmalloc(strlen(src)-strlen(dst)+strlen(var)+1);
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strncpy(src, prog->argv[argc_l -1], offset);
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safe_strncpy(src+offset, var, strlen(var)+1);
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/* If there are any remaining $ variables in the src string, put them back */
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if ((dst = strchr(prog->argv[argc_l -1]+offset+1,'$')) != NULL) {
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offset=strlen(src);
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safe_strncpy(src+strlen(src), dst, strlen(dst)+1);
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}
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prog->argv[argc_l -1] = src;
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} else {
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memset(dst, 0, strlen(src)-strlen(dst));
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}
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}
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#endif
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if (strpbrk(prog->argv[argc_l - 1],"*[]?")!= NULL){
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rc = glob(prog->argv[argc_l - 1], flags, NULL, &prog->glob_result);
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47
sh.c
47
sh.c
@ -49,7 +49,6 @@
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//#define DEBUG_SHELL
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#include "busybox.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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@ -62,6 +61,7 @@
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#include <sys/wait.h>
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#include <unistd.h>
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#include <getopt.h>
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#include "busybox.h"
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#include "cmdedit.h"
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static const int MAX_LINE = 256; /* size of input buffer for cwd data */
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@ -916,44 +916,57 @@ static void expand_argument(struct child_prog *prog, int *argcPtr,
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flags = 0;
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i = 0;
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}
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/* do shell variable substitution */
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if(*prog->argv[argc_l - 1] == '$') {
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if ((var = getenv(prog->argv[argc_l - 1] + 1))) {
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prog->argv[argc_l - 1] = var;
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}
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#ifdef BB_FEATURE_SH_ENVIRONMENT
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else {
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switch(*(prog->argv[argc_l - 1] + 1)) {
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/* do shell variable substitution */
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src = prog->argv[argc_l - 1];
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while((dst = strchr(src,'$')) != NULL){
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if (!(var = getenv(dst + 1))) {
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switch(*(dst+1)) {
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case '?':
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prog->argv[argc_l - 1] = itoa(last_return_code);
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var = itoa(last_return_code);
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break;
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case '$':
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prog->argv[argc_l - 1] = itoa(getpid());
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var = itoa(getpid());
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break;
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case '#':
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prog->argv[argc_l - 1] = itoa(argc-1);
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var = itoa(argc-1);
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break;
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case '!':
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if (last_bg_pid==-1)
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*(prog->argv[argc_l - 1])='\0';
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*(var)='\0';
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else
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prog->argv[argc_l - 1] = itoa(last_bg_pid);
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var = itoa(last_bg_pid);
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break;
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case '0':case '1':case '2':case '3':case '4':
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case '5':case '6':case '7':case '8':case '9':
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{
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int index=*(prog->argv[argc_l - 1] + 1)-48;
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int index=*(dst + 1)-48;
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if (index >= argc) {
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*(prog->argv[argc_l - 1])='\0';
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var='\0';
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} else {
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prog->argv[argc_l - 1] = argv[index];
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var = argv[index];
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}
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}
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break;
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}
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}
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#endif
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if (var) {
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int offset = dst-src;
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#warning I have a memory leak which needs to be plugged somehow
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src = (char*)xmalloc(strlen(src)-strlen(dst)+strlen(var)+1);
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strncpy(src, prog->argv[argc_l -1], offset);
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safe_strncpy(src+offset, var, strlen(var)+1);
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/* If there are any remaining $ variables in the src string, put them back */
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if ((dst = strchr(prog->argv[argc_l -1]+offset+1,'$')) != NULL) {
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offset=strlen(src);
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safe_strncpy(src+strlen(src), dst, strlen(dst)+1);
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}
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prog->argv[argc_l -1] = src;
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} else {
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memset(dst, 0, strlen(src)-strlen(dst));
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}
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}
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#endif
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if (strpbrk(prog->argv[argc_l - 1],"*[]?")!= NULL){
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rc = glob(prog->argv[argc_l - 1], flags, NULL, &prog->glob_result);
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47
shell/lash.c
47
shell/lash.c
@ -49,7 +49,6 @@
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//#define DEBUG_SHELL
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#include "busybox.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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@ -62,6 +61,7 @@
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#include <sys/wait.h>
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#include <unistd.h>
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#include <getopt.h>
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#include "busybox.h"
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#include "cmdedit.h"
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static const int MAX_LINE = 256; /* size of input buffer for cwd data */
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@ -916,44 +916,57 @@ static void expand_argument(struct child_prog *prog, int *argcPtr,
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flags = 0;
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i = 0;
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}
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/* do shell variable substitution */
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if(*prog->argv[argc_l - 1] == '$') {
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if ((var = getenv(prog->argv[argc_l - 1] + 1))) {
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prog->argv[argc_l - 1] = var;
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}
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#ifdef BB_FEATURE_SH_ENVIRONMENT
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else {
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switch(*(prog->argv[argc_l - 1] + 1)) {
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/* do shell variable substitution */
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src = prog->argv[argc_l - 1];
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while((dst = strchr(src,'$')) != NULL){
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if (!(var = getenv(dst + 1))) {
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switch(*(dst+1)) {
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case '?':
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prog->argv[argc_l - 1] = itoa(last_return_code);
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var = itoa(last_return_code);
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break;
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case '$':
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prog->argv[argc_l - 1] = itoa(getpid());
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var = itoa(getpid());
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break;
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case '#':
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prog->argv[argc_l - 1] = itoa(argc-1);
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var = itoa(argc-1);
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break;
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case '!':
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if (last_bg_pid==-1)
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*(prog->argv[argc_l - 1])='\0';
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*(var)='\0';
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else
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prog->argv[argc_l - 1] = itoa(last_bg_pid);
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var = itoa(last_bg_pid);
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break;
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case '0':case '1':case '2':case '3':case '4':
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case '5':case '6':case '7':case '8':case '9':
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{
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int index=*(prog->argv[argc_l - 1] + 1)-48;
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int index=*(dst + 1)-48;
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if (index >= argc) {
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*(prog->argv[argc_l - 1])='\0';
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var='\0';
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} else {
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prog->argv[argc_l - 1] = argv[index];
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var = argv[index];
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}
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}
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break;
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}
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}
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#endif
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if (var) {
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int offset = dst-src;
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#warning I have a memory leak which needs to be plugged somehow
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src = (char*)xmalloc(strlen(src)-strlen(dst)+strlen(var)+1);
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strncpy(src, prog->argv[argc_l -1], offset);
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safe_strncpy(src+offset, var, strlen(var)+1);
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/* If there are any remaining $ variables in the src string, put them back */
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if ((dst = strchr(prog->argv[argc_l -1]+offset+1,'$')) != NULL) {
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offset=strlen(src);
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safe_strncpy(src+strlen(src), dst, strlen(dst)+1);
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}
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prog->argv[argc_l -1] = src;
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} else {
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memset(dst, 0, strlen(src)-strlen(dst));
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}
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}
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#endif
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if (strpbrk(prog->argv[argc_l - 1],"*[]?")!= NULL){
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rc = glob(prog->argv[argc_l - 1], flags, NULL, &prog->glob_result);
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