Function to get Dynamic Memory Allocated Input from User in C

[stigma]

#include <stdio.h>
#include <stdlib.h>

char * getline(void) {
    char * line = malloc(100), * linep = line;
    size_t lenmax = 100, len = lenmax;
    int c;

    if(line == NULL)
        return NULL;

    for(;;) {
        c = fgetc(stdin);
        if(c == EOF)
            break;

        if(--len == 0) {
            len = lenmax;
			int linelen = (line-linep);
            char * linen = realloc(linep, lenmax *= 2);

            if(linen == NULL) {
                free(linep);
                return NULL;
            }
            // line = linen + (line - linep);
			line = linen+linelen;
            linep = linen;
        }

        if((*line++ = c) == '\n')
            break;
    }
    *line = '\0';
    return linep;
}

int main()
{
	char * ptext = NULL;
	
	printf("enter some text: ");
	
	ptext = getline();
	
	printf("\n\nthe text you entered was :\n\n");
	
	for(; !(*ptext=='\0') ; ++ptext)
	printf("%c", *ptext);
	
	return 0;
	
}