1 files changed, 142 insertions, 0 deletions
diff --git a/src/tools.c b/src/tools.c
new file mode 100644
index 0000000..2b7e85d
--- /dev/null
+++ b/src/tools.c
@@ -0,0 +1,142 @@
+/*
+Copyright 2015 Ian Jauslin
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+#include "tools.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+int factorial(int n){
+  int i;
+  int res=1;
+  for(i=2;i<=n;i++){
+    res*=i;
+  }
+  return(res);
+}
+
+int ipower(int n, int p){
+  int i;
+  int res=1;
+  for(i=1;i<=p;i++){
+    res*=n;
+  }
+  return(res);
+}
+
+// power of a double
+long double dpower(long double x, int p){
+  int i;
+  long double res=1.;
+  if(p>=0){
+    for(i=1;i<=p;i++){
+      res*=x;
+    }
+  }
+  else{
+    for(i=1;i<=-p;i++){
+      res/=x;
+    }
+  }
+    
+  return(res);
+}
+
+
+// find an element in a list whose first element is its size
+int list_find(int* list, int x){
+  int i;
+  for(i=1;i<=*list;i++){
+    if(list[i]==x){return(i);}
+  }
+  return(0);
+}
+
+// find an element in a list whose first element is not its number of elements (skips first element)
+int unlist_find(int* list, int size, int x){
+  int i;
+  for(i=1;i<size;i++){
+    if(list[i]==x){return(i);}
+  }
+  fprintf(stderr,"error: element %d not found\n",x);
+  exit(-1);
+}
+// find an element in a list whose first element is not its number of elements (skips first element)
+// no error reporting
+int unlist_find_noerr(int* list, int size, int x){
+  int i;
+  for(i=1;i<size;i++){
+    if(list[i]==x){return(i);}
+  }
+  return(-1);
+}
+
+
+// find an element in a list (checks first element)
+int intlist_find(int* list, int size, int x){
+  int i;
+  for(i=0;i<size;i++){
+    if(list[i]==x){return(i);}
+  }
+  return(-1);
+}
+// with error
+int intlist_find_err(int* list, int size, int x){
+  int i;
+  for(i=0;i<size;i++){
+    if(list[i]==x){return(i);}
+  }
+  fprintf(stderr,"error: element %d not found\n",x);
+  exit(-1);
+}
+
+
+
+// compare two lists
+int list_cmp(int* list1, int* list2){
+  if(*list1!=*list2){
+    return(0);
+  }
+  int* ptr1=list1+1;
+  int* ptr2=list2+1;
+  int i;
+  for(i=1;i<=*list1;i++){
+    if(*ptr1!=*ptr2){
+      return(0);
+      }
+    ptr1++;
+    ptr2++;
+  }
+  return(1);
+}
+
+
+// max and min
+int max(int x1, int x2){
+  if(x1>=x2){
+    return(x1);
+  }
+  else{
+    return(x2);
+  }
+}
+int min(int x1, int x2){
+  if(x1<=x2){
+    return(x1);
+  }
+  else{
+    return(x2);
+  }
+}