//#define BB_FEATURE_SH_BACKTICKS
//
//If, then, else, etc. support.. This should now behave basically
-//like any other Bourne shell...
+//like any other Bourne shell -- sortof...
#define BB_FEATURE_SH_IF_EXPRESSIONS
//
-/* This is currently a little broken... */
-//#define HANDLE_CONTINUATION_CHARS
+/* This is currently sortof broken, only for the brave... */
+#undef HANDLE_CONTINUATION_CHARS
+//
+/* This would be great -- if wordexp wouldn't strip all quoting
+ * out from the target strings... As is, a parser needs */
+#undef BB_FEATURE_SH_WORDEXP
//
//For debugging/development on the shell only...
//#define DEBUG_SHELL
#include <unistd.h>
#include <getopt.h>
-#undef __GLIBC__
-#undef __UCLIBC__
+//#define BB_FEATURE_SH_WORDEXP
-#if ( (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1) ) || defined (__UCLIBC__)
+#ifdef BB_FEATURE_SH_WORDEXP
#include <wordexp.h>
#define expand_t wordexp_t
#undef BB_FEATURE_SH_BACKTICKS
static char syntax_err[]="syntax error near unexpected token";
#endif
+static char *PS1;
+static char *PS2;
+
+
#ifdef DEBUG_SHELL
static inline void debug_printf(const char *format, ...)
{
else
newdir = child->argv[1];
if (chdir(newdir)) {
- printf("cd: %s: %s\n", newdir, strerror(errno));
+ printf("cd: %s: %m\n", newdir);
return EXIT_FAILURE;
}
getcwd(cwd, sizeof(char)*MAX_LINE);
static int builtin_export(struct child_prog *child)
{
int res;
+ char *v = child->argv[1];
- if (child->argv[1] == NULL) {
+ if (v == NULL) {
return (builtin_env(child));
}
- res = putenv(child->argv[1]);
+ res = putenv(v);
if (res)
- fprintf(stderr, "export: %s\n", strerror(errno));
+ fprintf(stderr, "export: %m\n");
+#ifndef BB_FEATURE_SH_SIMPLE_PROMPT
+ if (strncmp(v, "PS1=", 4)==0)
+ PS1 = getenv("PS1");
+ else if (strncmp(v, "PS2=", 4)==0)
+ PS2 = getenv("PS2");
+#endif
return (res);
}
if((s = strdup(string)))
res = putenv(s);
if (res)
- fprintf(stderr, "read: %s\n", strerror(errno));
+ fprintf(stderr, "read: %m\n");
}
else
fgets(string, sizeof(string), stdin);
static void free_job(struct job *cmd)
{
int i;
+ struct jobset *keep;
for (i = 0; i < cmd->num_progs; i++) {
free(cmd->progs[i].argv);
if (cmd->progs[i].redirects)
free(cmd->progs[i].redirects);
}
- free(cmd->progs);
+ if (cmd->progs)
+ free(cmd->progs);
if (cmd->text)
free(cmd->text);
- free(cmd->cmdbuf);
+ if (cmd->cmdbuf)
+ free(cmd->cmdbuf);
+ keep = cmd->job_list;
memset(cmd, 0, sizeof(struct job));
+ cmd->job_list = keep;
}
/* remove a job from the job_list */
if (openfd < 0) {
/* this could get lost if stderr has been redirected, but
bash and ash both lose it as well (though zsh doesn't!) */
- error_msg("error opening %s: %s", redir->filename,
- strerror(errno));
+ perror_msg("error opening %s", redir->filename);
return 1;
}
}
}
-#if defined(BB_FEATURE_SH_SIMPLE_PROMPT)
-static char* setup_prompt_string(int state)
+static inline void cmdedit_set_initial_prompt(void)
{
- char prompt_str[BUFSIZ];
-
- /* Set up the prompt */
- if (state == 0) {
- /* simple prompt */
- sprintf(prompt_str, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# ");
- } else {
- strcpy(prompt_str,"> ");
- }
-
- return(strdup(prompt_str)); /* Must free this memory */
-}
-
+#ifdef BB_FEATURE_SH_SIMPLE_PROMPT
+ PS1 = NULL;
+ PS2 = "> ";
#else
+ PS1 = getenv("PS1");
+ if(PS1==0) {
+ PS1 = "\\w \\$ ";
+ }
+ PS2 = getenv("PS2");
+ if(PS2==0)
+ PS2 = "> ";
+#endif
+}
-static char* setup_prompt_string(int state)
+static inline void setup_prompt_string(char **prompt_str)
{
- char user[9],buf[255],*s;
- char prompt[3];
- char prompt_str[BUFSIZ];
-
+#ifdef BB_FEATURE_SH_SIMPLE_PROMPT
/* Set up the prompt */
- if (state == 0) {
- /* get User Name and setup prompt */
- strcpy(prompt,( geteuid() != 0 ) ? "$ ":"# ");
- my_getpwuid(user, geteuid());
-
- /* get HostName */
- gethostname(buf, 255);
- s = strchr(buf, '.');
- if (s) {
- *s = 0;
- }
- } else {
- strcpy(prompt,"> ");
- }
-
- if (state == 0) {
- snprintf(prompt_str, BUFSIZ-1, "[%s@%s %s]%s", user, buf,
- get_last_path_component(cwd), prompt);
+ if (shell_context == 0) {
+ if (PS1)
+ free(PS1);
+ PS1=xmalloc(strlen(cwd)+4);
+ sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# ");
+ *prompt_str = PS1;
} else {
- sprintf(prompt_str, "%s", prompt);
+ *prompt_str = PS2;
}
- return(strdup(prompt_str)); /* Must free this memory */
+#else
+ *prompt_str = (shell_context==0)? PS1 : PS2;
+#endif
}
-#endif
-
static int get_command(FILE * source, char *command)
{
char *prompt_str;
}
if (source == stdin) {
- prompt_str = setup_prompt_string(shell_context);
+ setup_prompt_string(&prompt_str);
-#ifdef BB_FEATURE_SH_COMMAND_EDITING
+#ifdef BB_FEATURE_COMMAND_EDITING
/*
** enable command line editing only while a command line
** is actually being read; otherwise, we'll end up bequeathing
*/
cmdedit_read_input(prompt_str, command);
cmdedit_terminate();
- free(prompt_str);
return 0;
#else
fputs(prompt_str, stdout);
- free(prompt_str);
#endif
}
return 1;
}
- /* remove trailing newline */
- chomp(command);
-
return 0;
}
}
#endif
+#if defined BB_FEATURE_SH_ENVIRONMENT && ! defined BB_FEATURE_SH_WORDEXP
+char * strsep_space( char *string, int * index)
+{
+ char *token, *begin;
+
+ begin = string;
+
+ /* Short circuit the trivial case */
+ if ( !string || ! string[*index])
+ return NULL;
+
+ /* Find the end of the token. */
+ while( string && string[*index] && !isspace(string[*index]) ) {
+ (*index)++;
+ }
+
+ /* Find the end of any whitespace trailing behind
+ * the token and let that be part of the token */
+ while( string && string[*index] && isspace(string[*index]) ) {
+ (*index)++;
+ }
+
+ if (! string && *index==0) {
+ /* Nothing useful was found */
+ return NULL;
+ }
+
+ token = xmalloc(*index+1);
+ token[*index] = '\0';
+ strncpy(token, string, *index);
+
+ return token;
+}
+#endif
+
+
static int expand_arguments(char *command)
{
#ifdef BB_FEATURE_SH_ENVIRONMENT
expand_t expand_result;
char *src, *dst, *var;
+ int index = 0;
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 */
chomp(command);
+
+ /* Fix up escape sequences to be the Real Thing(tm) */
+ while( command && command[index]) {
+ if (command[index] == '\\') {
+ char *tmp = command+index+1;
+ command[index] = process_escape_sequence( &tmp );
+ memmove(command+index + 1, tmp, strlen(tmp)+1);
+ }
+ index++;
+ }
#ifdef BB_FEATURE_SH_ENVIRONMENT
-#if ( (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1) ) || defined (__UCLIBC__)
+#ifdef BB_FEATURE_SH_WORDEXP
/* This first part uses wordexp() which is a wonderful C lib
* function which expands nearly everything. */
- retval = wordexp (command, &expand_result, 0);
+ retval = wordexp (command, &expand_result, WRDE_SHOWERR);
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) {
return FALSE;
}
- /* Convert from char** (one word per string) to a simple char*,
- * but don't overflow command which is BUFSIZ in length */
- *command = '\0';
- 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");
- return FALSE;
+ if (expand_result.we_wordc > 0) {
+ /* Convert from char** (one word per string) to a simple char*,
+ * but don't overflow command which is BUFSIZ in length */
+ *command = '\0';
+ 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);
+ return FALSE;
+ }
+ strcat(command+total_length, expand_result.we_wordv[i++]);
+ strcat(command+total_length, " ");
+ total_length+=length;
}
- strcat(command+total_length, expand_result.we_wordv[i++]);
- strcat(command+total_length, " ");
- total_length+=length;
+ wordfree (&expand_result);
}
- 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;
+ int flags = GLOB_NOCHECK
+#ifdef GLOB_BRACE
+ | GLOB_BRACE
+#endif
+#ifdef GLOB_TILDE
+ | GLOB_TILDE
+#endif
+ ;
+ char *tmpcmd, *cmd, *cmd_copy;
/* We need a clean copy, so strsep can mess up the copy while
- * we write stuff into the original in a minute */
- char * cmd = strdup(command);
- for (tmpcmd = cmd; (tmpcmd = strsep(&cmd, " \t")) != NULL;) {
+ * we write stuff into the original (in a minute) */
+ cmd = cmd_copy = strdup(command);
+ *command = '\0';
+ for (index = 0, tmpcmd = cmd;
+ (tmpcmd = strsep_space(cmd, &index)) != NULL; cmd += index, index=0) {
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;
-
+ free(tmpcmd); /* Free mem allocated by strsep_space */
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) {
- length=strlen(expand_result.gl_pathv[i])+1;
- if (BUFSIZ-total_length-length <= 0) {
- error_msg("out of space during expansion");
+ for (i=0; i < expand_result.gl_pathc; i++) {
+ length=strlen(expand_result.gl_pathv[i]);
+ if (total_length+length+1 >= BUFSIZ) {
+ error_msg(out_of_space);
return FALSE;
}
- strcat(command+total_length, expand_result.gl_pathv[i++]);
- strcat(command+total_length, " ");
+ if (i>0) {
+ strcat(command+total_length, " ");
+ total_length+=1;
+ }
+ strcat(command+total_length, expand_result.gl_pathv[i]);
total_length+=length;
}
+ globfree (&expand_result);
}
}
-
- free(cmd);
- globfree (&expand_result);
+ free(cmd_copy);
+ 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;
+ 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;
+ int num_skip_chars=0;
+ int dstlen = strlen(dst);
+ /* Is this a ${foo} type variable? */
+ if (dstlen >=2 && *(dst+1) == '{') {
+ src=strchr(dst+1, '}');
+ num_skip_chars=1;
+ } else {
+ src=dst+1;
+ while(isalnum(*src) || *src=='_') src++;
+ }
+ if (src == NULL) {
+ src = dst+dstlen;
+ }
+ delim_hold=*src;
+ *src='\0'; /* temporary */
+ var = getenv(dst + 1 + num_skip_chars);
+ *src=delim_hold;
+ src += num_skip_chars;
+ }
+ if (var == NULL) {
/* Seems we got an un-expandable variable. So delete it. */
- char *next_dst;
- if ((next_dst=strpbrk(dst+1, " \t~`!$^&*()=|\\{}[];\"'<>?.")) == 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+1);
+ /* Now copy in the new stuff */
+ memcpy(dst, var, subst_len);
+ src = dst+subst_len;
}
}
-
-
-
#endif
return TRUE;
}
chptr++;
if (!*chptr) {
- error_msg("file name expected after %c", *src);
+ error_msg("file name expected after %c", *(src-1));
free_job(job);
job->num_progs=0;
return 1;
break;
#else
error_msg("character expected after \\");
- free(command);
free_job(job);
return 1;
#endif
if (!parse_command(&next_command, &newjob, &inbg) &&
newjob.num_progs) {
int pipefds[2] = {-1,-1};
- debug_printf( "job=%p being fed to run_command by busy_loop()'\n", &newjob);
+ debug_printf( "job=%p fed to run_command by busy_loop()'\n",
+ &newjob);
run_command(&newjob, inbg, pipefds);
}
else {
atexit(free_memory);
#endif
+#ifdef BB_FEATURE_COMMAND_EDITING
+ cmdedit_set_initial_prompt();
+#else
+ PS1 = NULL;
+ PS2 = "> ";
+#endif
+
return (busy_loop(input));
}
+