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-rw-r--r--toys/pending/sh.c102
1 files changed, 73 insertions, 29 deletions
diff --git a/toys/pending/sh.c b/toys/pending/sh.c
index 8c898cd5..e8a11ce7 100644
--- a/toys/pending/sh.c
+++ b/toys/pending/sh.c
@@ -184,7 +184,7 @@ static void run_command(struct sh_process *pp)
pipe[0] = 0;
pipe[1] = 1;
if (-1 == (pp->pid = xpopen_both(pp->arg.v, pipe)))
- perror_msg("%s: not found", *pp->arg.v);
+ perror_msg("%s: vfork", *pp->arg.v);
else pp->exit = xpclose_both(pp->pid, 0);
}
@@ -290,7 +290,7 @@ static char *parse_word(char *start)
// pointer to start of unused part of line if it needs another line of input.
static char *parse_line(char *line, struct double_list **pipeline)
{
- char *start = line, *end, *s;
+ char *start = line, *end, *s, *ex, *add;
struct sh_arg *arg = 0;
struct double_list *pl, *expect = 0;
unsigned i, paren = 0;
@@ -350,40 +350,81 @@ static char *parse_line(char *line, struct double_list **pipeline)
for (pl = *pipeline; pl ; pl = (pl->next == *pipeline) ? 0 : pl->next) {
arg = (void *)pl->data;
if (!arg->c) continue;
+ add = 0;
// parse flow control statements in this command line
- for (i = 0; i<arg->c; i++) {
- char *ex = expect ? expect->prev->data : 0;
-
+ for (i = 0; ; i++) {
+ ex = expect ? expect->prev->data : 0;
s = arg->v[i];
- if (!strcmp(s, "if")) ex = "then";
+
+ // push word to expect to end this block, and expect a command first
+ if (add) {
+ dlist_add(&expect, add);
+ dlist_add(&expect, add = 0);
+ }
+
+ // end of statement?
+ if (i == arg->c) break;
+
+ // When waiting for { it must be next symbol, but can be on a new line.
+ if (ex && !strcmp(ex, "{") && (strcmp(s, "{") || (!i && end))) {
+ syntax_err("need {");
+ goto flush;
+ }
+
+ if (!strcmp(s, "if")) add = "then";
else if (!strcmp(s, "for") || !strcmp(s, "select")
- || !strcmp(s, "while") || !strcmp(s, "until")) ex = "do";
- else if (!strcmp(s, "case")) ex = "esac";
- else if (!strcmp(s, "{")) ex = "}";
- else if (!strcmp(s, "[[")) ex = "]]";
+ || !strcmp(s, "while") || !strcmp(s, "until")) add = "do";
+ else if (!strcmp(s, "case")) add = "esac";
+ else if (!strcmp(s, "{")) add = "}";
+ else if (!strcmp(s, "[[")) add = "]]";
+
+ // function NAME () [nl] { [nl] body ; }
+ // Why can you to declare functions inside other functions?
+ else if (arg->c>i+1 && !strcmp(arg->v[i+1], "(")) goto funky;
+ else if (!strcmp(s, "function")) {
+ i++;
+funky:
+ // At this point we can only have a function: barf if it's invalid
+ if (arg->c<i+3 || !strcmp(arg->v[i+1], "(")
+ || !strcmp(arg->v[i+2], ")"))
+ {
+ syntax_err("bad function ()");
+ goto flush;
+ }
+ dlist_add(&expect, "}");
+ dlist_add(&expect, 0);
+ dlist_add(&expect, "{");
- // If we expect a non-flow-control command, eat rest of line
- else if (expect && !ex) {
+ // Expecting NULL will take any otherwise unrecognized word
+ } else if (expect && !ex) {
free(dlist_pop(&expect));
continue;
- // Did we find a specific word we were waiting for?
- } else if (ex && !strcmp(arg->v[i], ex)) {
+ // If we expect nothing and didn't just start a new flow control block,
+ // rest of statement is a command and arguments, so stop now
+ } else if (!ex) break;
+
+ if (add) continue;
+
+ // If we got here we expect a word to end this block: is this it?
+ if (!strcmp(arg->v[i], ex)) {
free(dlist_pop(&expect));
+
+ // can't "if | then" or "while && do", only ; or newline works
if (end && !strcmp(end, ";")) {
- // can't if | then or while && do, only ; or newline counts
syntax_err("bad %s", end);
goto flush;
}
- if (!strcmp(s, "do")) dlist_add(&expect, "done");
- else if (!strcmp(s, "then")) dlist_add(&expect, "fi\0A");
- break;
+
+ // if it's a multipart block, what comes next?
+ if (!strcmp(s, "do")) ex = "done";
+ else if (!strcmp(s, "then")) add = "fi\0A";
// fi could have elif, which queues a then.
- } else if (ex && !strcmp(ex, "fi")) {
+ } else if (!strcmp(ex, "fi")) {
if (!strcmp(s, "elif")) {
free(dlist_pop(&expect));
- dlist_add(&expect, "then");
+ add = "then";
// catch duplicate else while we're here
} else if (!strcmp(s, "else")) {
if (ex[3] != 'A') {
@@ -391,23 +432,21 @@ static char *parse_line(char *line, struct double_list **pipeline)
goto flush;
}
free(dlist_pop(&expect));
- dlist_add(&expect, "fi\0B");
+ add = "fi\0B";
}
- } else break;
-
- dlist_add(&expect, ex);
+ }
}
- // Record how the previous stanza ended
+ // Record how the previous stanza ended: ; | & ;; || && ;& ;;& |& NULL
end = arg->v[arg->c];
}
- // If we need more lines to finish flow control...
- // TODO: functions
- if (expect) {
+ // Do we need more lines to finish a flow control statement?
+ if (expect || paren) {
llist_traverse(expect, free);
return start;
}
+ // iterate through the commands running each one
for (pl = *pipeline; pl ; pl = (pl->next == *pipeline) ? 0 : pl->next) {
struct sh_process *pp = xzalloc(sizeof(struct sh_process));
@@ -445,7 +484,12 @@ void sh_main(void)
size_t linelen = 0;
// Prompt and read line
- if (!f) do_prompt(getenv(command ? "PS2" : "PS1"));
+ if (!f) {
+ char *s = getenv(command ? "PS2" : "PS1");
+
+ if (!s) s = command ? "> " : (getpid() ? "\\$ " : "# ");
+ do_prompt(s);
+ }
if (1 > getline(&new, &linelen, f ? f : stdin)) break;
if (f) TT.lineno++;