shell: fromdec/fromhex: parse sign

While we also have atoi, our custom fromdec/fromhex are more similar to strtol, and thus useful to parse "number.number" or such stuff. And since I need to pass negative hex numbers in later commits, here it is. Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

shell: fromdec/fromhex: parse sign
While we also have atoi, our custom fromdec/fromhex are more similar to strtol, and thus useful to parse "number.number" or such stuff. And since I need to pass negative hex numbers in later commits, here it is. Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
ae0d629c · Alessandro Rubini · 882ba996 · ae0d629c · ae0d629c
Commit ae0d629c authored Mar 13, 2017 by Alessandro Rubini
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Showing with 15 additions and 9 deletions

fake-temp.c dev/fake-temp.c +3 -5

shell.c shell/shell.c +12 -4

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--- a/dev/fake-temp.c
+++ b/dev/fake-temp.c
@@ -42,16 +42,14 @@ static int cmd_faketemp(const char *args[])
 	}
 	for (i = 0; i < 3 && args[i]; i++) {
-		int sign = 1, val;
+		int val;
-		/* accept negative, and at most one decimal */
+		/* accept at most one decimal */
-		if (args[i][0] == '-')
-			sign = -1, args[i]++;
 		dot = fromdec(args[i], &val);
 		val <<= 16;
 		if (dot[0] == '.' && dot[1] >= '0' && dot[1] <= '9')
 			val += 0x10000 / 10 * (dot[1] - '0');
-		temp_fake_data[i].t = val * sign;
+		temp_fake_data[i].t = val;
 	}
 	return 0;
 }

--- a/shell/shell.c
+++ b/shell/shell.c
@@ -214,8 +214,12 @@ int shell_interactive()
 const char *fromhex(const char *hex, int *v)
 {
-	int o = 0;
+	int o = 0, sign = 1;
+	if (hex && *hex == '-') {
+		sign = -1;
+		hex++;
+	}
 	for (; hex && *hex; ++hex) {
 		if (*hex >= '0' && *hex <= '9') {
 			o = (o << 4) + (*hex - '0');
@@ -228,14 +232,18 @@ const char *fromhex(const char *hex, int *v)
 		}
 	}
-	*v = o;
+	*v = o * sign;
 	return hex;
 }
 const char *fromdec(const char *dec, int *v)
 {
-	int o = 0;
+	int o = 0, sign = 1;
+	if (dec && *dec == '-') {
+		sign = -1;
+		dec++;
+	}
 	for (; dec && *dec; ++dec) {
 		if (*dec >= '0' && *dec <= '9') {
 			o = (o * 10) + (*dec - '0');
@@ -244,7 +252,7 @@ const char *fromdec(const char *dec, int *v)
 		}
 	}
-	*v = o;
+	*v = o * sign;
 	return dec;
 }