Fix exit value for -e with failed backquote or pipeline

This fixes rakitzis/rc issue #40.

Both cases suffered from a misconception of statprint() in which the necessary
check for -e happens. The checked status value gets passed to statprint() as an
argument but the corresponding value passed to rc_exit() in case the status is
non-zero comes from getstatus(), which requires that the checked status is
written to statuses[] first. For pipelines this happened in the wrong order and
for backquotes the status value was not put into statuses[] at all.

Making statprint() a static helper function prevents this mistake by only
leaving the setstatus family of functions to handle status codes.

3 files changed, 5 insertions, 4 deletions

diff --git a/glom.c b/glom.c
index c44f0d5..7f90d9d 100644
--- a/glom.c
+++ b/glom.c
@@ -266,7 +266,7 @@ static List *backq(Node *ifs, Node *n) {
 	bq = bqinput(glom(ifs), p[0]);
 	close(p[0]);
 	rc_wait4(pid, &sp, TRUE);
-	statprint(-1, sp);
+	setstatus(-1, sp);
 	varassign("bqstatus", word(strstatus(sp), NULL), FALSE);
 	sigchk();
 	return bq;
diff --git a/rc.h b/rc.h
index 2912e60..68d338d 100644
--- a/rc.h
+++ b/rc.h
@@ -347,7 +347,6 @@ extern void set(bool);
 extern void setstatus(pid_t, int);
 extern List *sgetstatus(void);
 extern void setpipestatus(int [], int);
-extern void statprint(pid_t, int);
 extern void ssetstatus(char **);
 extern char *strstatus(int s);
 
diff --git a/status.c b/status.c
index 5b37aa5..b4e6a05 100644
--- a/status.c
+++ b/status.c
@@ -7,6 +7,8 @@
 
 /* status == the wait() value of the last command in the pipeline, or the last command */
 
+static void statprint(pid_t, int);
+
 static int statuses[512];
 static int pipelength = 1;
 
@@ -49,8 +51,8 @@ extern void set(bool code) {
 extern void setpipestatus(int stats[], int num) {
 	int i;
 	for (i = 0; i < (pipelength = num); i++) {
-		statprint(-1, stats[i]);
 		statuses[i] = stats[i];
+		statprint(-1, stats[i]);
 	}
 }
 
@@ -64,7 +66,7 @@ extern void setstatus(pid_t pid, int i) {
 
 /* print a message if termination was with a signal, and if the child dumped core. exit on error if -e is set */
 
-extern void statprint(pid_t pid, int i) {
+static void statprint(pid_t pid, int i) {
 	if (WIFSIGNALED(i)) {
 		int t = WTERMSIG(i);
 		char *msg = ((t > 0) && (t < NUMOFSIGNALS) ? signals[WTERMSIG(i)].msg : "");