add -1 option, error checking for parse_number()

1 files changed, 25 insertions, 9 deletions

diff --git a/uxd.c b/uxd.c
index 3aea465..95a91bd 100644
--- a/uxd.c
+++ b/uxd.c
@@ -66,7 +66,7 @@ int bad_color = RED;
 int special_color = PURPLE;
 
 /* toggles between 0 and 1 for each normal character */
-int cur_normal_hilite = 1;
+int cur_normal_hilite = 0;
 
 /* highlight types */
 #define HL_NORMAL 0
@@ -110,6 +110,7 @@ char * const special_symbols[] = {
 };
 
 /* options */
+int alternate_colors = 1; /* -1 */
 int print_info = 0;   /* -i */
 int bold = 0;         /* -b */
 int hilite_multi = 0; /* -r */
@@ -192,8 +193,18 @@ void parse_colors(char *arg) {
 	bad_color = arg[3] - '0';
 }
 
-long parse_number(const char *s) {
-	return strtol(s, NULL, 0); /* TODO: error checking */
+long parse_number(int opt, const char *s) {
+	char *e;
+	long result;
+
+	result = strtol(s, &e, 0);
+
+	if(*e) {
+		fprintf(stderr, "%s: invalid number for -%c option.\n", self, opt);
+		exit(1);
+	}
+
+	return result;
 }
 
 void parse_args(int argc, char **argv) {
@@ -206,8 +217,10 @@ void parse_args(int argc, char **argv) {
 			version();
 	}
 
-	while((opt = my_getopt(argc, argv, "ic:nbl:rmo:S:s:uhv")) != -1) {
+	while((opt = my_getopt(argc, argv, "1ic:nbl:rmo:S:s:uhv")) != -1) {
 		switch(opt) {
+			case '1':
+				alternate_colors = 0; break;
 			case 'i':
 				print_info = 1; break;
 			case 'c':
@@ -217,18 +230,18 @@ void parse_args(int argc, char **argv) {
 			case 'b':
 				bold = 1; break;
 			case 'l':
-				limit = parse_number(optarg); break;
+				limit = parse_number(opt, optarg); break;
 			case 'r':
 				hilite_multi = 1; break;
 			case 'm':
 				mono = 1; break;
 			case 'o':
-				display_offset = parse_number(optarg); break;
+				display_offset = parse_number(opt, optarg); break;
 			case 'S':
 				seek_offset_zero = 1;
 				/* fall thru */
 			case 's':
-				seekpos = parse_number(optarg);
+				seekpos = parse_number(opt, optarg);
 				break;
 			case 'u':
 				hex_byte_fmt = "%02X"; hex_word_fmt = "%04X: "; break;
@@ -330,7 +343,8 @@ void print_line(void) {
 }
 
 void next_normal_hilite() {
-	cur_normal_hilite = !cur_normal_hilite;
+	if(alternate_colors)
+		cur_normal_hilite = !cur_normal_hilite;
 }
 
 void append_color(char *buf, int hl_type) {
@@ -557,7 +571,6 @@ int dump_utf8_char(void) {
 	} else {
 		hl_type = HL_NORMAL;
 		printable = (char *)bytes;
-		next_normal_hilite();
 	}
 
 	/* human-readable (right) column: */
@@ -572,6 +585,9 @@ int dump_utf8_char(void) {
 		append_left(bytes[i], (i != cont_count), hl_type);
 	}
 
+	if(hl_type == HL_NORMAL || hl_type == HL_NORM_INV)
+		next_normal_hilite();
+
 	return 1;
 }