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-rw-r--r--toys/pending/sh.c54
1 files changed, 31 insertions, 23 deletions
diff --git a/toys/pending/sh.c b/toys/pending/sh.c
index 67b8459e..262ca5db 100644
--- a/toys/pending/sh.c
+++ b/toys/pending/sh.c
@@ -825,7 +825,7 @@ char *slashcopy(char *s, char c)
for (ii = 0; s[ii] != c; ii++) if (s[ii] == '\\') ii++;
ss = xmalloc(ii+1);
for (ii = jj = 0; s[jj] != c; ii++)
- if ('\\'==(s[ii] = s[jj++])) s[ii] = s[jj++];
+ if ('\\'==(ss[ii] = s[jj++])) ss[ii] = s[jj++];
ss[ii] = 0;
return ss;
@@ -1384,7 +1384,7 @@ static char *pl2str(struct sh_pipeline *pl)
// Expand arguments and perform redirections. Return new process object with
// expanded args. This can be called from command or block context.
-static struct sh_process *expand_redir(struct sh_arg *arg, int envlen, int *urd)
+static struct sh_process *expand_redir(struct sh_arg *arg, int skip, int *urd)
{
struct sh_process *pp;
char *s = s, *ss, *sss, *cv = 0;
@@ -1399,7 +1399,7 @@ static struct sh_process *expand_redir(struct sh_arg *arg, int envlen, int *urd)
// When we redirect, we copy each displaced filehandle to restore it later.
// Expand arguments and perform redirections
- for (j = envlen; j<arg->c; j++) {
+ for (j = skip; j<arg->c; j++) {
int saveclose = 0, bad = 0;
s = arg->v[j];
@@ -1621,41 +1621,36 @@ static void sh_exec(char **argv)
static struct sh_process *run_command(struct sh_arg *arg)
{
char *s, *ss = 0, *sss, **old = environ;
- struct sh_arg env;
- int envlen, jj, ll;
+ struct sh_arg env = {0};
+ int envlen, jj = 0, ll;
struct sh_process *pp;
+ struct arg_list *delete = 0;
struct toy_list *tl;
if (BUGBUG) dprintf(255, "run_command %s\n", arg->v[0]);
- // Grab leading variable assignments
+ // Count leading variable assignments
for (envlen = 0; envlen<arg->c; envlen++) {
s = varend(arg->v[envlen]);
if (s == arg->v[envlen] || *s != '=') break;
}
- // expand arguments and perform redirects
- pp = expand_redir(arg, envlen, 0);
-
-if (BUGBUG) { int i; dprintf(255, "envlen=%d arg->c=%d run=", envlen, arg->c); for (i=0; i<pp->arg.c; i++) dprintf(255, "'%s' ", pp->arg.v[i]); dprintf(255, "\n"); }
+if (BUGBUG) { int i; dprintf(255, "envlen=%d arg->c=%d run=", envlen, arg->c); for (i=0; i<arg->c; i++) dprintf(255, "'%s' ", arg->v[i]); dprintf(255, "\n"); }
// perform assignments locally if there's no command
if (envlen == arg->c) {
- for (jj = 0; jj<envlen; jj++) {
+ while (jj<envlen) {
if (!(s = expand_one_arg(arg->v[jj], NO_PATH|NO_SPLIT, 0))) break;
- setvar((s == arg->v[jj]) ? xstrdup(s) : s);
+ setvar((s == arg->v[jj++]) ? xstrdup(s) : s);
}
- goto out;
- }
+ if (jj == envlen) setvarval("_", "");
// assign leading environment variables (if any) in temp environ copy
- jj = 0;
- env.v = 0;
- if (!pp->exit && envlen) {
- for (env.c = 0; environ[env.c]; env.c++);
+ } else if (envlen) {
+ while (environ[env.c]) env.c++;
memcpy(env.v = xmalloc(sizeof(char *)*(env.c+33)), environ,
sizeof(char *)*(env.c+1));
for (; jj<envlen; jj++) {
- if (!(sss = expand_one_arg(arg->v[jj], NO_PATH|NO_SPLIT, &pp->delete)))
+ if (!(sss = expand_one_arg(arg->v[jj], NO_PATH|NO_SPLIT, &delete)))
break;
for (ll = 0; ll<env.c; ll++) {
for (s = sss, ss = env.v[ll]; *s == *ss && *s != '='; s++, ss++);
@@ -1668,8 +1663,20 @@ if (BUGBUG) { int i; dprintf(255, "envlen=%d arg->c=%d run=", envlen, arg->c); f
environ = env.v;
}
+ // return early if error or assignment only
+ if (envlen == arg->c || jj != envlen) {
+ pp = xzalloc(sizeof(struct sh_process));
+ pp->exit = jj != envlen;
+
+ goto out;
+ }
+
+ // expand arguments and perform redirects
+ pp = expand_redir(arg, envlen, 0);
+if (BUGBUG) { int i; dprintf(255, "cooked arg->c=%d run=", arg->c); for (i=0; i<pp->arg.c; i++) dprintf(255, "'%s' ", pp->arg.v[i]); dprintf(255, "\n"); }
+
// Do nothing if nothing to do
- if (jj != envlen || pp->exit || !pp->arg.v);
+ if (pp->exit || !pp->arg.v);
// else if (!strcmp(*pp->arg.v, "(("))
// TODO: handle ((math)) currently totally broken
// TODO: call functions()
@@ -1703,17 +1710,18 @@ if (BUGBUG) { int i; dprintf(255, "envlen=%d arg->c=%d run=", envlen, arg->c); f
if (toys.optargs != toys.argv+1) free(toys.optargs);
if (toys.old_umask) umask(toys.old_umask);
memcpy(&toys, &temp, jj);
- } else if (-1==(pp->pid = xpopen_setup(pp->arg.v+envlen, 0, sh_exec)))
+ } else if (-1==(pp->pid = xpopen_setup(pp->arg.v, 0, sh_exec)))
perror_msg("%s: vfork", *pp->arg.v);
// Restore environment variables
environ = old;
free(env.v);
-out:
- setvarval("_", (envlen == arg->c) ? "" : s);
+ if (pp->arg.c) setvarval("_", pp->arg.v[pp->arg.c-1]);
// cleanup process
unredirect(pp->urd);
+out:
+ llist_traverse(delete, llist_free_arg);
return pp;
}