busybox: fix printf ptest failure with glibc 2.43

Following ptests were failing on aarch64 after glibc 2.43 upgrade:
  - printf_understands_%s_'"x'_"'y"_"'zTAIL"
  - printf_handles_positive_numbers_for_%f

Backport fix from Debian bug #1128825.

Upstream-Status: Submitted [https://bugs.debian.org/cgi-bin/bugreport.cgi?att=1;bug=1128825;filename=busybox_glibc-2.43_thp.patch;msg=10]

Signed-off-by: Hemanth Kumar M D <Hemanth.KumarMD@windriver.com>

diff --git a/coreutils/printf.c b/coreutils/printf.c
index 3cd48cfcc..a5d995ab5 100644
--- a/coreutils/printf.c
+++ b/coreutils/printf.c
@@ -191,6 +191,7 @@ static void print_direc(char *format, unsigned fmt_length,
 	double dv;
 	char saved;
 	char *have_prec, *have_width;
+	int saved_errno, ret;
 
 	saved = format[fmt_length];
 	format[fmt_length] = '\0';
@@ -205,22 +206,32 @@ static void print_direc(char *format, unsigned fmt_length,
 
 	switch (format[fmt_length - 1]) {
 	case 'c':
-		printf(format, *argument);
+		saved_errno = errno;
+		ret = printf(format, *argument);
+		/* Restore errno if there was no error */
+		if (ret >= 0) {
+			errno = saved_errno;
+		}
 		break;
 	case 'd':
 	case 'i':
 		llv = my_xstrtoll(skip_whitespace(argument));
  print_long:
+		saved_errno = errno;
 		if (!have_width) {
 			if (!have_prec)
-				printf(format, llv);
+				ret = printf(format, llv);
 			else
-				printf(format, precision, llv);
+				ret = printf(format, precision, llv);
 		} else {
 			if (!have_prec)
-				printf(format, field_width, llv);
+				ret = printf(format, field_width, llv);
 			else
-				printf(format, field_width, precision, llv);
+				ret = printf(format, field_width, precision, llv);
+		}
+		/* Restore errno if there was no error */
+		if (ret >= 0) {
+			errno = saved_errno;
 		}
 		break;
 	case 'o':
@@ -238,16 +249,21 @@ static void print_direc(char *format, unsigned fmt_length,
 		} else {
 			/* Hope compiler will optimize it out by moving call
 			 * instruction after the ifs... */
+			saved_errno = errno;
 			if (!have_width) {
 				if (!have_prec)
-					printf(format, argument, /*unused:*/ argument, argument);
+					ret = printf(format, argument, /*unused:*/ argument, argument);
 				else
-					printf(format, precision, argument, /*unused:*/ argument);
+					ret = printf(format, precision, argument, /*unused:*/ argument);
 			} else {
 				if (!have_prec)
-					printf(format, field_width, argument, /*unused:*/ argument);
+					ret = printf(format, field_width, argument, /*unused:*/ argument);
 				else
-					printf(format, field_width, precision, argument);
+					ret = printf(format, field_width, precision, argument);
+			}
+			/* Restore errno if there was no error */
+			if (ret >= 0) {
+				errno = saved_errno;
 			}
 			break;
 		}
@@ -257,16 +273,21 @@ static void print_direc(char *format, unsigned fmt_length,
 	case 'g':
 	case 'G':
 		dv = my_xstrtod(argument);
+		saved_errno = errno;
 		if (!have_width) {
 			if (!have_prec)
-				printf(format, dv);
+				ret = printf(format, dv);
 			else
-				printf(format, precision, dv);
+				ret = printf(format, precision, dv);
 		} else {
 			if (!have_prec)
-				printf(format, field_width, dv);
+				ret = printf(format, field_width, dv);
 			else
-				printf(format, field_width, precision, dv);
+				ret = printf(format, field_width, precision, dv);
+		}
+		/* Restore errno if there was no error */
+		if (ret >= 0) {
+			errno = saved_errno;
 		}
 		break;
 	} /* switch */