Initial commit

stringsplit.c

+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+char** string_split(char* input, char delim)
+{
+    char** split_strings = malloc(sizeof(char*));
+    char* charPtr;
+
+    size_t split_idx             = 0;
+    size_t num_allocated_strings = 1;
+    size_t extend                = 0;
+
+    for(charPtr = input; *charPtr != '\0'; ++charPtr)
+    {
+        if(*charPtr == delim || *(charPtr+1) == '\0')
+        {
+            if(*(charPtr+1) == '\0') extend = 1; //extend the range by one for the null byte at the end
+            char* string_element = calloc(1, sizeof(char));
+
+            for(size_t i = 0; input != charPtr+extend; ++input, ++i)
+            {
+                if(string_element[i] == '\0')
+                {
+                    //allocate another char and add a null byte to the end
+                    string_element = realloc(string_element, sizeof(char) * (strlen(string_element) + 1));
+                    string_element[i+1] = '\0';
+                }
+                string_element[i] = *input;
+            }
+            split_strings[split_idx++] = string_element;
+            num_allocated_strings++;
+            
+            //allocate another c-string if we're not at the end of the input
+            split_strings = realloc(split_strings, sizeof(char*) * num_allocated_strings);    
+
+            //skip over the delimiter 
+            input++;
+            extend = 0;
+        }
+    }
+    free(charPtr);
+    free(input);
+    return split_strings;
+}
+
+int main()
+{
+    char* str = "what day is it today?";
+    char delim = ' ';
+    char** split = string_split(str, delim);
+
+    printf("split: %s\n", split[0]);
+    printf("split: %s\n", split[1]);
+    printf("split: %s\n", split[2]);
+    printf("split: %s\n", split[3]);
+    printf("split: %s\n", split[4]);
+
+    return 1;
+}
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