altos: Allow negative values for pyro configuration data

All of the integer pyro configuration parameters may be negative, so
parse that correctly.

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 15 insertions, 2 deletions

diff --git a/src/kernel/ao_pyro.c b/src/kernel/ao_pyro.c
index 154edad5..3044d565 100644
--- a/src/kernel/ao_pyro.c
+++ b/src/kernel/ao_pyro.c
@@ -499,13 +499,26 @@ ao_pyro_set(void)
 		}
 		pyro_tmp.flags |= ao_pyro_values[v].flag;
 		if (ao_pyro_values[v].offset != NO_VALUE) {
+			uint8_t negative = 0;
+			ao_cmd_white();
+			if (ao_cmd_lex_c == '-') {
+				negative = 1;
+				ao_cmd_lex();
+			}
 			ao_cmd_decimal();
 			if (ao_cmd_status != ao_cmd_success)
 				return;
-			if (ao_pyro_values[v].flag & AO_PYRO_8_BIT_VALUE)
+			if (ao_pyro_values[v].flag & AO_PYRO_8_BIT_VALUE) {
+				if (negative) {
+					ao_cmd_status = ao_cmd_syntax_error;
+					return;
+				}
 				*((uint8_t *) ((char *) &pyro_tmp + ao_pyro_values[v].offset)) = ao_cmd_lex_i;
-			else
+			} else {
+				if (negative)
+					ao_cmd_lex_i = -ao_cmd_lex_i;
 				*((int16_t *) ((char *) &pyro_tmp + ao_pyro_values[v].offset)) = ao_cmd_lex_i;
+			}
 		}
 	}
 	_ao_config_edit_start();