titlecase.c

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#include <ctype.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <memory.h>
#include <string.h>
 
#include "titlecase.h"
 
char* titlecase(const char* s)
{
    char* buffer = NULL;
 
    if (s != NULL)
    {
        size_t stringSize = strlen(s);
        buffer = calloc(1, stringSize + 1);
        if (buffer != NULL)
        {
            for (size_t index = 0; index < stringSize; index++)
            {
                int c = s[index];
                // Stop on space or non-alphabetic character (presumably punctuation)
                if (isspace(c) || !isalpha(c))
                {
                    // Reached end of a word, copy rest of string over
                    // Note: buffer was initialized with 0's and we allocated
                    // for enough space to hold string plus null terminator.
                    strcat(buffer, s + index);
                    // And we are done
                    break;
                }
 
                if (index == 0)
                {
                    c = toupper(c);
                }
                else
                {
                    c = tolower(c);
                }
                buffer[index] = (char)c;
            }
        }
    }
 
    return buffer;
}