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/*
 * libtu/misc.c
 *
 * Copyright (c) Tuomo Valkonen 1999-2002. 
 *
 * You may distribute and modify this library under the terms of either
 * the Clarified Artistic License or the GNU LGPL, version 2.1 or later.
 */

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

#include <libtu/misc.h>


void *malloczero(size_t size)
{
    void *p=malloc(size);
    
    if(p!=NULL)
        memset(p, 0, size);
    
    return p;
}


void *remalloczero(void *ptr, size_t oldsize, size_t newsize)
{
    void *p=NULL;
    
    if(newsize!=0){
        p=realloc(ptr, newsize);
        
        if(p==NULL)
            return NULL;
    
        if(newsize>oldsize)
            memset((char*)p+oldsize, 0, newsize-oldsize);
    }

    return p;
}


char *scopyn(const char *p, size_t l)
{
    char *pn=(char*)malloc(l+1);
    
    if(pn==NULL)
        return NULL;
    
    memcpy(pn, p, l+1);
    
    return pn;
}


char *scopy(const char *p)
{
    size_t l=strlen(p);
    return scopyn(p, l);
}
    
    
char *scat(const char *p1, const char *p2)
{
    size_t l1, l2;
    char*pn;
    
    l1=strlen(p1);
    l2=strlen(p2);
    
    pn=(char*)malloc(l1+l2+1);
    
    if(pn==NULL)
        return NULL;
    
    memcpy(pn, p1, l1);
    memcpy(pn+l1, p2, l2+1);
    
    return pn;
}


char *scat3(const char *p1, const char *p2, const char *p3)
{
    size_t l1, l2, l3;
    char *pn;
    
    l1=strlen(p1);
    l2=strlen(p2);
    l3=strlen(p3);
    
    pn=(char*)malloc(l1+l2+l3+1);
    
    if(pn==NULL)
        return NULL;
    
    memcpy(pn, p1, l1);
    memcpy(pn+l1, p2, l2);
    memcpy(pn+l1+l2, p3, l3+1);
    
    return pn;
}


char *scatn(const char *s1, ssize_t l1, const char *s2, ssize_t l2)
{
    size_t tlen=1;
    char *s;
    
    if(l1<0)
        l1=strlen(s1);
    
    if(l2<0)
        l2=strlen(s2);
    
    tlen+=l1+l2;
    
    s=(char*)malloc(tlen);
    
    if(s==NULL)
        return NULL;
    
    memcpy(s, s1, l1);
    memcpy(s+l1, s2, l2);
    s[l1+l2]='\0';
    
    return s;
}


/* */


const char *simple_basename(const char *name)
{
    const char *p;
    
    p=name+strlen(name)-1;
    
    /* Skip any trailing slashes */
    while(*p=='/'){
        /* root? */
        if(p==name)
            return name;
        p--;
    }
    
    while(p!=name){
        if(*p=='/')
            return p+1;
        p--;
    }
    
    return name;
}


void stripws(char *p)
{
    int l;
    
    l=strspn(p, " ");
    if(l!=0)
        strcpy(p, p+l);
    l=strlen(p);
    
    while(--l>=0){
        if(*(p+l)!=' ')
            break;
    }
    *(p+l+1)='\0';
}


/* */


bool readf(FILE *f, void *buf, size_t n)
{
    return fread(buf, 1, n, f)!=1;
}


bool writef(FILE *f, const void *buf, size_t n)
{
    return fwrite(buf, 1, n, f)!=1;
}