utility for string arrays

git-svn-id: svn://svn.open-ils.org/OpenSRF/trunk@292 9efc2488-bf62-4759-914b-345cdb29e865

diff --git a/src/libstack/string_array.c b/src/libstack/string_array.c
new file mode 100644 (file)
index 0000000..27d6c4e
--- /dev/null
+++ b/src/libstack/string_array.c
@@ -0,0 +1,89 @@
+#include "opensrf/string_array.h"
+
+/*
+int main() {
+       string_array* arr = init_string_array(1);
+       string_array_add(arr, "1");
+       fprintf(stderr,"adding 3\n");
+       string_array_add(arr, "3");
+       string_array_destroy(arr);
+       return 0;
+}
+*/
+
+
+
+string_array* init_string_array(int size) {
+       if(size > STRING_ARRAY_MAX_SIZE)
+               fatal_handler("init_string_array size is too large");
+
+       string_array* arr = 
+               (string_array*) safe_malloc(sizeof(string_array));
+       arr->array = (char**) safe_malloc(size * sizeof(char*));
+       arr->size = 0;
+       arr->arr_size = size;
+       return arr;
+}
+
+
+void string_array_add(string_array* arr, char* str) {
+       if(arr == NULL || str == NULL ) {
+               warning_handler("Invalid params to string_array_add");
+               return;
+       }
+
+       if( strlen(str) < 1 ) return;
+
+       arr->size++;
+       //fprintf(stderr,"size is %d\n", arr->size);
+
+       if( arr->size > STRING_ARRAY_MAX_SIZE ) 
+               fatal_handler("string_array_add size is too large");
+
+       /* if necessary, double capacity */
+       if(arr->size >= arr->arr_size) {
+               arr->arr_size *= 2;
+               debug_handler("string_array: Doubling array size to %d", arr->arr_size);
+               char** tmp = (char**) safe_malloc(arr->arr_size * sizeof(char*));
+               int i;
+
+               /* copy the string pointers over */
+               for( i = 0; i!= arr->size; i++ ) 
+                       tmp[i] = arr->array[i];
+
+               free(arr->array);
+               arr->array = tmp;
+       }
+
+       //fprintf(stderr, "String is %s", str);
+       debug_handler("string_array_add: Adding string %s", str);
+       //arr->array[arr->size - 1] = (char*) safe_malloc(strlen(str));
+       arr->array[arr->size - 1] = strdup(str);
+       //fprintf(stderr,"we have %s\n", arr->array[arr->size - 1]);
+}
+
+char* string_array_get_string(string_array* arr, int index) {
+       if(!arr || index < 0 || index >= arr->size )
+               return NULL;
+       char* str = arr->array[index]; 
+
+       if(str == NULL)
+               warning_handler("Somehow we have a NULL string in the string array");
+
+       debug_handler("string_array_get_string: getting string %s", str);
+       return str;
+}
+
+
+void string_array_destroy(string_array* arr) {
+       if(!arr) return;
+       int i;
+       for( i = 0; i!= arr->size; i++ ) {
+               if( arr->array[i] != NULL ) {
+                       debug_handler("Freeing string from string array %s", arr->array[i]);
+                       free(arr->array[i]);
+               }
+       }
+       free(arr->array);
+       free(arr);
+}