Diff: util.c

Revision:

0:826c6171fc1b

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/util.c	Wed Jun 20 14:57:48 2012 +0000
@@ -0,0 +1,78 @@
+// convert character to an int
+//
+int ctoi(char c)
+{
+  int i=-1;
+  
+  if (c >= '0' && c <= '9') {
+    i = c - '0';
+  }
+
+  //printf("char: %c  int %d\n", c, i); 
+ 
+  return i;
+}
+
+
+// convert string to floating point
+//
+double cvstof(char *s)
+{
+  double f=0.0;
+  double mult = 0.1;
+  bool neg = false;
+  //char dec = 1;
+  
+  // leading spaces
+  while (*s == ' ' || *s == '\t') {
+    s++;
+    if (*s == 0) break;
+  }
+
+  // What about negative numbers?
+  if (*s == '-') {
+    neg = true;
+    s++;
+  }
+
+  // before the decimal
+  //
+  while (*s != 0) {
+    if (*s == '.') {
+      s++;
+      break;
+    }
+    f = (f * 10.0) + (double) ctoi(*s);
+    s++;
+  }
+  // after the decimal
+  while (*s != 0 && *s >= '0' && *s <= '9') {
+    f += (double) ctoi(*s) * mult;
+    mult /= 10;
+    s++;
+  }
+  
+  // if we were negative...
+  if (neg) f = -f;
+  
+  return f;
+}
+
+// copy t to s until delimiter is reached
+// return location of delimiter+1 in t
+// if s or t null, return null
+char *split(char *s, char *t, int max, char delim)
+{
+  int i = 0;
+  
+  if (s == 0 || t == 0)
+    return 0;
+
+  while (*t != 0 && *t != '\n' && *t != delim && i < max) {
+    *s++ = *t++;
+    i++;
+  }
+  *s = 0;
+    
+  return t+1;
+}