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-rw-r--r--shell/lash.c168
1 files changed, 83 insertions, 85 deletions
diff --git a/shell/lash.c b/shell/lash.c
index e1bdc87..865f10b 100644
--- a/shell/lash.c
+++ b/shell/lash.c
@@ -916,6 +916,7 @@ static int expand_arguments(char *command)
expand_t expand_result;
char *src, *dst, *var;
int i=0, length, total_length=0, retval;
+ const char *out_of_space = "out of space during expansion";
#endif
/* get rid of the terminating \n */
@@ -931,7 +932,7 @@ static int expand_arguments(char *command)
if (retval == WRDE_NOSPACE) {
/* Mem may have been allocated... */
wordfree (&expand_result);
- error_msg("out of space during expansion");
+ error_msg(out_of_space);
return FALSE;
}
if (retval < 0) {
@@ -946,7 +947,7 @@ static int expand_arguments(char *command)
while (i < expand_result.we_wordc && total_length < BUFSIZ) {
length=strlen(expand_result.we_wordv[i])+1;
if (BUFSIZ-total_length-length <= 0) {
- error_msg("out of space during expansion");
+ error_msg(out_of_space);
return FALSE;
}
strcat(command+total_length, expand_result.we_wordv[i++]);
@@ -956,139 +957,136 @@ static int expand_arguments(char *command)
wordfree (&expand_result);
#else
- /* Ok. They don't have glibc and they don't have uClibc. Chances are
- * about 100% they don't have wordexp(), so instead, the best we can do is
- * use glob, which is better then nothing, but certainly not perfect */
+ /* Ok. They don't have a recent glibc and they don't have uClibc. Chances
+ * are about 100% they don't have wordexp(). So instead the best we can do
+ * is use glob and then fixup environment variables and such ourselves.
+ * This is better then nothing, but certainly not perfect */
- /* It turns out that glob is very stupid. We have to feed it
- * one word at a time since it can't cope with a full string.
- * Here we convert command (char*) into cmd (char**, one word
- * per string) */
+ /* It turns out that glob is very stupid. We have to feed it one word at a
+ * time since it can't cope with a full string. Here we convert command
+ * (char*) into cmd (char**, one word per string) */
{
int flags = GLOB_NOCHECK|GLOB_BRACE|GLOB_TILDE;
char * tmpcmd;
/* We need a clean copy, so strsep can mess up the copy while
- * we write stuff into the original in a minute */
+ * we write stuff into the original (in a minute) */
char * cmd = strdup(command);
+ *command = '\0';
for (tmpcmd = cmd; (tmpcmd = strsep(&cmd, " \t")) != NULL;) {
if (*tmpcmd == '\0')
break;
retval = glob(tmpcmd, flags, NULL, &expand_result);
- /* We can't haveGLOB_APPEND on the first glob call,
- * so put it there now */
- if (! (flags & GLOB_APPEND) )
- flags |= GLOB_APPEND;
-
if (retval == GLOB_NOSPACE) {
/* Mem may have been allocated... */
globfree (&expand_result);
- error_msg("out of space during expansion");
+ error_msg(out_of_space);
return FALSE;
- }
- if (retval != 0 && retval != GLOB_NOMATCH) {
- /* Some other error. */
+ } else if (retval != 0) {
+ /* Some other error. GLOB_NOMATCH shouldn't
+ * happen because of the GLOB_NOCHECK flag in
+ * the glob call. */
error_msg("syntax error");
return FALSE;
- }
-
+ } else {
/* Convert from char** (one word per string) to a simple char*,
* but don't overflow command which is BUFSIZ in length */
- if ( expand_result.gl_pathc > 1) {
- *command = '\0';
- while (i < expand_result.gl_pathc && total_length < BUFSIZ) {
+ for (i=0; i < expand_result.gl_pathc; i++) {
length=strlen(expand_result.gl_pathv[i])+1;
if (BUFSIZ-total_length-length <= 0) {
- error_msg("out of space during expansion");
+ error_msg(out_of_space);
return FALSE;
}
- strcat(command+total_length, expand_result.gl_pathv[i++]);
+ strcat(command+total_length, expand_result.gl_pathv[i]);
strcat(command+total_length, " ");
total_length+=length;
}
+ globfree (&expand_result);
}
}
-
free(cmd);
- globfree (&expand_result);
+ trim(command);
}
#endif
-
- /* FIXME -- this routine (which is only used when folks
- * don't have a C library with wordexp) needs a bit of help
- * to handle things like 'echo $PATH$0' */
-
+
/* Now do the shell variable substitutions which
* wordexp can't do for us, namely $? and $! */
src = command;
while((dst = strchr(src,'$')) != NULL){
- /* Ok -- got a $ -- now clean up any trailing mess */
- trim(dst);
- if (!(var = getenv(dst + 1))) {
- switch(*(dst+1)) {
- case '?':
- var = itoa(last_return_code);
- break;
- case '!':
- if (last_bg_pid==-1)
- *(var)='\0';
- else
- var = itoa(last_bg_pid);
- break;
+ printf("dollar '%s'\n", dst);
+ var = NULL;
+ switch(*(dst+1)) {
+ case '?':
+ var = itoa(last_return_code);
+ break;
+ case '!':
+ if (last_bg_pid==-1)
+ *(var)='\0';
+ else
+ var = itoa(last_bg_pid);
+ break;
/* Everything else like $$, $#, $[0-9], etc should all be
* expanded by wordexp(), so we can in theory skip that stuff
* here, but just to be on the safe side (i.e. since uClibc
* wordexp doesn't do this stuff yet), lets leave it in for
* now. */
- case '$':
- var = itoa(getpid());
- break;
- case '#':
- var = itoa(argc-1);
- break;
- case '0':case '1':case '2':case '3':case '4':
- case '5':case '6':case '7':case '8':case '9':
- {
- int index=*(dst + 1)-48;
- if (index >= argc) {
- var='\0';
- } else {
- var = argv[index];
- }
+ case '$':
+ var = itoa(getpid());
+ break;
+ case '#':
+ var = itoa(argc-1);
+ break;
+ case '0':case '1':case '2':case '3':case '4':
+ case '5':case '6':case '7':case '8':case '9':
+ {
+ int index=*(dst + 1)-48;
+ if (index >= argc) {
+ var='\0';
+ } else {
+ var = argv[index];
}
- break;
+ }
+ break;
- }
}
if (var) {
- int subst_len = strlen(var);
- char *next_dst;
- if ((next_dst=strpbrk(dst+1, " \t~`!$^&*()=|\\{}[];\"'<>?.")) == NULL) {
- next_dst = dst;
- }
- src = (char*)xrealloc(src, strlen(src) - strlen(next_dst)+strlen(var)+1);
- /* Move stuff to the end of the string to accommodate filling
- * the created gap with the new stuff */
- memmove(dst+subst_len, next_dst+1, subst_len);
- /* Now copy in the new stuff */
- strncpy(dst, var, subst_len+1);
- src = dst;
- src++;
+ /* a single character construction was found, and
+ * already handled in the case statement */
+ src=dst+2;
} else {
+ /* Looks like an environment variable */
+ char delim_hold;
+ src=strpbrk(dst+1, " \t~`!$^&*()=|\\{}[];\"'<>?.");
+ if (src == NULL) {
+ src = dst+strlen(dst);
+ }
+ delim_hold=*src;
+ *src='\0'; /* temporary */
+ var = getenv(dst + 1);
+ *src=delim_hold;
+ }
+ if (var == NULL) {
/* Seems we got an un-expandable variable. So delete it. */
- char *next_dst;
- if ((next_dst=strpbrk(dst+1, " \t~`!$^&*()=|\\{}[];\"'<>?.")) == NULL) {
- next_dst=dst+1+strlen(dst);
+ var = "";
+ }
+ {
+ int subst_len = strlen(var);
+ int trail_len = strlen(src);
+ if (dst+subst_len+trail_len >= command+BUFSIZ) {
+ error_msg(out_of_space);
+ return FALSE;
}
- /* Move stuff to the end of the string to accommodate filling
- * the created gap with the new stuff */
- memmove(dst, next_dst, next_dst-dst);
+ /* Move stuff to the end of the string to accommodate
+ * filling the created gap with the new stuff */
+ memmove(dst+subst_len, src, trail_len);
+ *(dst+subst_len+trail_len)='\0';
+ /* Now copy in the new stuff */
+ memcpy(dst, var, subst_len);
+ src = dst+subst_len;
}
}
-
-
-
+ printf("expanded '%s'\n", command);
#endif
return TRUE;
generated by cgit v1.1 at 2024-12-27 13:49:37 +0000