src/lib/common.c 1.131

Index: src/lib/common.c
===================================================================
RCS file: /projects/compbio/cvsroot/kent/src/lib/common.c,v
retrieving revision 1.130
retrieving revision 1.131
diff -b -B -U 4 -r1.130 -r1.131
--- src/lib/common.c	10 May 2009 02:09:16 -0000	1.130
+++ src/lib/common.c	26 Jun 2009 19:57:33 -0000	1.131
@@ -1154,8 +1154,29 @@
 strcpy(resultPtr, string);
 return result;
 }
 
+int strSwapStrs(char *string, int sz,char *old, char *new)
+/* Swaps all occurnces of the old with the new in string. Need not be same size
+   Swaps in place but restricted by sz.  Returns count of swaps or -1 for sz failure. */
+{
+// WARNING: called at low level, so no errors allowed.
+int count = 0;
+char *p=NULL;
+for(p=strstr(string,old);p!=NULL;p=strstr(p+strlen(old),old))
+    count++;
+if(count == 0)
+    return 0;
+if((strlen(string)+(count*(strlen(new) - strlen(old))))>=sz)
+    return -1;
+for(p=strstr(string,old);p!=NULL;p=strstr(p+strlen(new),old))
+    {
+    memmove(p+strlen(new),p+strlen(old),strlen(p+strlen(old))+1); // NULL at end is also moved!
+    memcpy(p,new,strlen(new));
+    }
+return count;
+}
+
 char *strLower(char *s)
 /* Convert entire string to lower case */
 {
 char c;