Allow "x,y" in addition to "x y" formatted data points.

svn path=/head/; revision=19863

math/xgraph/files/patch-ab

@@ -0,0 +1,28 @@
+--- xgraph.c.orig	Tue Nov 23 04:29:38 1993
++++ xgraph.c	Mon Jun 28 00:44:15 1999
+@@ -46,8 +46,6 @@
+ #define BTNPAD		1
+ #define BTNINTER	3
+ 
+-#define MAX(a,b)	((a) > (b) ? (a) : (b))
+-#define MIN(a,b)	((a) < (b) ? (a) : (b))
+ #define ABS(x)		((x) < 0 ? -(x) : (x))
+ #define ZERO_THRES	1.0E-07
+ 
+@@ -266,6 +264,7 @@
+ 	if (!strm) {
+ 	    (void) fprintf(stderr, "Warning:  cannot open file `%s'\n",
+ 			   inFileNames[idx]);
++	    errs++;
+ 	} else {
+ 	    if ((maxitems = ReadData(strm, inFileNames[idx])) < 0) {
+ 		errs++;
+@@ -1369,6 +1368,8 @@
+ 	    while (*line && (*line != '\n') && (*line != '"')) line++;
+ 	    if (*line) *line = '\0';
+ 	} else {
++	    /* treat comma's as white space */
++	    for (first=line; *first; ++first) if (*first == ',') *first = ' ';
+ 	    first = line;
+ 	    while (*line && !isspace(*line)) line++;
+ 	    if (*line) {