From a856598c95e5820e855f2483a49db5aa5e97176f Mon Sep 17 00:00:00 2001
From: Johannes Löthberg <johannes@kyriasis.com>
Date: Mon, 10 Nov 2014 23:50:09 +0100
Subject: Make non-negatable arguments unsigned, make parse_uint

---
 src/utils.c | 24 ++++++++++++++++++++++++
 src/utils.h |  1 +
 src/yawa.c  | 12 ++++++------
 src/yawa.h  | 12 ++++++------
 4 files changed, 37 insertions(+), 12 deletions(-)

diff --git a/src/utils.c b/src/utils.c
index 20cc6d4..0441ba2 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -33,6 +33,30 @@ parse_int(char *string, char *arg)
 	return (int)val;
 }
 
+unsigned int
+parse_uint(char *string, char *arg)
+{
+	errno = 0;
+	char *endptr;
+	unsigned long val = strtoul(string, &endptr, 10);
+	if (errno != 0)
+	{
+		char *errormsg;
+		asprintf(&errormsg, "parse_uint: failed to parse %s", arg);
+
+		perror(errormsg);
+		free(errormsg);
+		exit(-2);
+	}
+
+	if (endptr == string)
+	{
+		fprintf(stderr, "Valid %s not found\n", arg);
+		exit(-2);
+	}
+	return (unsigned int)val;
+}
+
 bool
 parse_color(char *hex, Color *c, int a)
 {
diff --git a/src/utils.h b/src/utils.h
index 1e50975..ae9612e 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -3,6 +3,7 @@
 #include <stdbool.h>
 
 int parse_int(char *string, char *arg);
+unsigned int parse_uint(char *string, char *arg);
 bool parse_color(char *arg, Color *c, int a);
 
 #endif
diff --git a/src/yawa.c b/src/yawa.c
index a7978cf..dce73d7 100644
--- a/src/yawa.c
+++ b/src/yawa.c
@@ -90,27 +90,27 @@ parse_opt(int key, char *arg, struct argp_state *state)
 
 		case 'b':
 			arguments->blur = true;
-			arguments->blur_radius = parse_int(arg, "blur radius");
+			arguments->blur_radius = parse_uint(arg, "blur radius");
 			break;
 
 		case 'S':
 			arguments->sharpen = true;
-			arguments->sharpen_radius = parse_int(arg, "sharpen radius");
+			arguments->sharpen_radius = parse_uint(arg, "sharpen radius");
 			break;
 
 		case 'o':
 			arguments->contrast = true;
-			arguments->contrast_amount = parse_int(arg, "contrast amount");
+			arguments->contrast_amount = parse_uint(arg, "contrast amount");
 			break;
 
 		case 'B':
 			arguments->brightness = true;
-			arguments->brightness_amount = parse_int(arg, "brightness amount");
+			arguments->brightness_amount = parse_uint(arg, "brightness amount");
 			break;
 
 		case 'G':
 			arguments->gamma = true;
-			arguments->gamma_amount = parse_int(arg, "gamma amount");
+			arguments->gamma_amount = parse_uint(arg, "gamma amount");
 			break;
 
 		case 'v':
@@ -128,7 +128,7 @@ parse_opt(int key, char *arg, struct argp_state *state)
 
 		case 'A':
 			arguments->alpha = true;
-			arguments->alpha_amount = parse_int(arg, "alpha amount");
+			arguments->alpha_amount = parse_uint(arg, "alpha amount");
 			break;
 
 		case 'w':
diff --git a/src/yawa.h b/src/yawa.h
index 8c86fe0..60d3ee8 100644
--- a/src/yawa.h
+++ b/src/yawa.h
@@ -29,12 +29,12 @@ struct arguments {
 	char *tint_color;
 
 	int angle;
-	int blur_radius;
-	int sharpen_radius;
-	int contrast_amount;
-	int brightness_amount;
-	int gamma_amount;
-	int alpha_amount;
+	unsigned int blur_radius;
+	unsigned int sharpen_radius;
+	unsigned int contrast_amount;
+	unsigned int brightness_amount;
+	unsigned int gamma_amount;
+	unsigned int alpha_amount;
 
 	bool add: 1;
 	bool gradient: 1;
-- 
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