diff options
Diffstat (limited to 'shell/lash.c')
| -rw-r--r-- | shell/lash.c | 47 |
1 files changed, 30 insertions, 17 deletions
diff --git a/shell/lash.c b/shell/lash.c index 76ef16a..077cb11 100644 --- a/shell/lash.c +++ b/shell/lash.c @@ -49,7 +49,6 @@ //#define DEBUG_SHELL -#include "busybox.h" #include <stdio.h> #include <stdlib.h> #include <ctype.h> @@ -62,6 +61,7 @@ #include <sys/wait.h> #include <unistd.h> #include <getopt.h> +#include "busybox.h" #include "cmdedit.h" static const int MAX_LINE = 256; /* size of input buffer for cwd data */ @@ -916,44 +916,57 @@ static void expand_argument(struct child_prog *prog, int *argcPtr, flags = 0; i = 0; } - /* do shell variable substitution */ - if(*prog->argv[argc_l - 1] == '$') { - if ((var = getenv(prog->argv[argc_l - 1] + 1))) { - prog->argv[argc_l - 1] = var; - } #ifdef BB_FEATURE_SH_ENVIRONMENT - else { - switch(*(prog->argv[argc_l - 1] + 1)) { + /* do shell variable substitution */ + src = prog->argv[argc_l - 1]; + while((dst = strchr(src,'$')) != NULL){ + if (!(var = getenv(dst + 1))) { + switch(*(dst+1)) { case '?': - prog->argv[argc_l - 1] = itoa(last_return_code); + var = itoa(last_return_code); break; case '$': - prog->argv[argc_l - 1] = itoa(getpid()); + var = itoa(getpid()); break; case '#': - prog->argv[argc_l - 1] = itoa(argc-1); + var = itoa(argc-1); break; case '!': if (last_bg_pid==-1) - *(prog->argv[argc_l - 1])='\0'; + *(var)='\0'; else - prog->argv[argc_l - 1] = itoa(last_bg_pid); + var = itoa(last_bg_pid); break; case '0':case '1':case '2':case '3':case '4': case '5':case '6':case '7':case '8':case '9': { - int index=*(prog->argv[argc_l - 1] + 1)-48; + int index=*(dst + 1)-48; if (index >= argc) { - *(prog->argv[argc_l - 1])='\0'; + var='\0'; } else { - prog->argv[argc_l - 1] = argv[index]; + var = argv[index]; } } break; } } -#endif + if (var) { + int offset = dst-src; +#warning I have a memory leak which needs to be plugged somehow + src = (char*)xmalloc(strlen(src)-strlen(dst)+strlen(var)+1); + strncpy(src, prog->argv[argc_l -1], offset); + safe_strncpy(src+offset, var, strlen(var)+1); + /* If there are any remaining $ variables in the src string, put them back */ + if ((dst = strchr(prog->argv[argc_l -1]+offset+1,'$')) != NULL) { + offset=strlen(src); + safe_strncpy(src+strlen(src), dst, strlen(dst)+1); + } + prog->argv[argc_l -1] = src; + } else { + memset(dst, 0, strlen(src)-strlen(dst)); + } } +#endif if (strpbrk(prog->argv[argc_l - 1],"*[]?")!= NULL){ rc = glob(prog->argv[argc_l - 1], flags, NULL, &prog->glob_result); |