X-Git-Url: https://git.kernel.dk/?p=fio.git;a=blobdiff_plain;f=tickmarks.c;h=808de676e758120ca6531f9d1328871ef4d9b402;hp=52fd556817a8102ef95d8d74a21a89db5d17a6a4;hb=e97412c38bedc4f365bdf4abe1ff8f6694587a86;hpb=1e1ffcc41c12011f665d8f962d0d387305e32522

diff --git a/tickmarks.c b/tickmarks.c
index 52fd5568..808de676 100644
--- a/tickmarks.c
+++ b/tickmarks.c
@@ -3,7 +3,7 @@
 #include <malloc.h>
 #include <string.h>
 
-/* 
+/*
  * adapted from Paul Heckbert's algorithm on p 657-659 of
  * Andrew S. Glassner's book, "Graphics Gems"
  * ISBN 0-12-286166-3
@@ -39,47 +39,56 @@ static double nicenum(double x, int round)
 	return 10.0 * pow(10.0, exp);
 }
 
-static void shorten(struct tickmark *tm, int nticks)
+static void shorten(struct tickmark *tm, int nticks, int *power_of_ten,
+			int use_KMG_symbols, int base_offset)
 {
-	int i, l, minshorten, can_shorten_by;
+	const char shorten_chr[] = { 0, 'K', 'M', 'G', 'P', 'E', 0 };
+	int i, l, minshorten, shorten_idx = 0;
 	char *str;
-	char shorten_char = '?';
 
 	minshorten = 100;
 	for (i = 0; i < nticks; i++) {
 		str = tm[i].string;
 		l = strlen(str);
 
+		if (strcmp(str, "0") == 0)
+			continue;
 		if (l > 9 && strcmp(&str[l - 9], "000000000") == 0) {
-			can_shorten_by = 9;
-			shorten_char = 'G';
+			*power_of_ten = 9;
+			shorten_idx = 3;
 		} else if (6 < minshorten && l > 6 &&
 				strcmp(&str[l - 6], "000000") == 0) {
-			can_shorten_by = 6;
-			shorten_char = 'M';
+			*power_of_ten = 6;
+			shorten_idx = 2;
 		} else if (l > 3 && strcmp(&str[l - 3], "000") == 0) {
-			can_shorten_by = 3;
-			shorten_char = 'K';
+			*power_of_ten = 3;
+			shorten_idx = 1;
 		} else {
-			can_shorten_by = 0;
+			*power_of_ten = 0;
 		}
 
-		if (can_shorten_by < minshorten)
-			minshorten = can_shorten_by;
+		if (*power_of_ten < minshorten)
+			minshorten = *power_of_ten;
 	}
 
 	if (minshorten == 0)
 		return;
+	if (!use_KMG_symbols)
+		shorten_idx = 0;
+	else if (base_offset)
+		shorten_idx += base_offset;
 
 	for (i = 0; i < nticks; i++) {
 		str = tm[i].string;
 		l = strlen(str);
-		str[l - minshorten] = shorten_char;
-		str[l - minshorten + 1] = '\0';
+		str[l - minshorten] = shorten_chr[shorten_idx];
+		if (shorten_idx)
+			str[l - minshorten + 1] = '\0';
 	}
 }
 
-int calc_tickmarks(double min, double max, int nticks, struct tickmark **tm)
+int calc_tickmarks(double min, double max, int nticks, struct tickmark **tm,
+		int *power_of_ten, int use_KMG_symbols, int base_offset)
 {
 	char str[100];
 	int nfrac;
@@ -105,7 +114,7 @@ int calc_tickmarks(double min, double max, int nticks, struct tickmark **tm)
 		sprintf((*tm)[i].string, str, x);
 		i++;
 	}
-	shorten(*tm, i);
+	shorten(*tm, i, power_of_ten, use_KMG_symbols, base_offset);
 	return i;
 }
 
@@ -119,20 +128,20 @@ static void test_range(double x, double y)
 	printf("Testing range %g - %g\n", x, y);
 	nticks = calc_tickmarks(x, y, 10, &tm);
 
-	for (i = 0; i < nticks; i++) {
+	for (i = 0; i < nticks; i++)
 		printf("   (%s) %g\n", tm[i].string, tm[i].value);
-	}
+
 	printf("\n\n");
 	free(tm);
 }
 
 int main(int argc, char *argv[])
 {
-	test_range(0.0005, 0.008);	
-	test_range(0.5, 0.8);	
-	test_range(5.5, 8.8);	
-	test_range(50.5, 80.8);	
-	test_range(-20, 20.8);	
-	test_range(-30, 700.8);	
+	test_range(0.0005, 0.008);
+	test_range(0.5, 0.8);
+	test_range(5.5, 8.8);
+	test_range(50.5, 80.8);
+	test_range(-20, 20.8);
+	test_range(-30, 700.8);
 }
 #endif