makomk

#include <stdio.h>#include <stdlib.h>#include <stdarg.h>#include <string.h>#include <assert.h>#define mstring(x) (x)->string#define minit(x) { (x)->string = NULL; (x)->string_len=0; }#define mfree(x) { if((x)->string) { free((x)->string); (x)->string=NULL; } (x)->string_len=0; }typedef struct{    char *string;    int string_len;} mpointer;int mprintf (mpointer * p, const char *format, ...){    va_list arg;    int len, size = 256, curlen;    if(p->string == NULL)     {        p->string=malloc(size); p->string[0] = 0;	p->string_len = 0; curlen = 0;    }    else    {        p->string=realloc(p->string, (p->string_len + size));	curlen = strlen(p->string);    }     while(1)     {        va_start (arg, format);        len = vsnprintf(p->string+curlen, size, format, arg);	va_end (arg);        /* Some glibc versions apparently return -1 if buffer too small */        if(len > -1 && len < size) break;	/* The return value doesn't include end null */        size = ( len < 0 ? size * 2 : len + 1 );	p->string=realloc(p->string, (p->string_len + size));    }    p->string_len += size;    return len;}int main(int argc, char **argv){    mpointer test;    minit(&test);        mprintf(&test, "Hello world\n");    mprintf(&test, "This is a funny test\n");    mprintf(&test, "Of an self reallocating function\n");    mprintf(&test, "that shud work with %s\n", "variables");    printf("This is test (%i): \n\"%s\"\n", strlen(test.string), test.string);    mfree(&test);    exit(0);}