Subversion Repositories planix.SVN

#include <u.h>
#include <libc.h>
#include <bio.h>
#include <libsec.h>
#include <ctype.h>

#include "iso9660.h"

typedef struct Stringtab        Stringtab;
struct Stringtab {
        Stringtab *link;
        char *str;
};

static Stringtab *stab[1024];

static uint
hash(char *s)
{
        uint h;
        uchar *p;

        h = 0;
        for(p=(uchar*)s; *p; p++)
                h = h*37 + *p;
        return h;
}

static char*
estrdup(char *s)
{
        if((s = strdup(s)) == nil)
                sysfatal("strdup(%.10s): out of memory", s);
        return s;
}

char*
atom(char *str)
{
        uint h;
        Stringtab *tab;
        
        h = hash(str) % nelem(stab);
        for(tab=stab[h]; tab; tab=tab->link)
                if(strcmp(str, tab->str) == 0)
                        return tab->str;

        tab = emalloc(sizeof *tab);
        tab->str = estrdup(str);
        tab->link = stab[h];
        stab[h] = tab;
        return tab->str;
}

void*
emalloc(ulong n)
{
        void *p;

        if((p = malloc(n)) == nil)
                sysfatal("malloc(%lud): out of memory", n);
        memset(p, 0, n);
        return p;
}

void*
erealloc(void *v, ulong n)
{
        if((v = realloc(v, n)) == nil)
                sysfatal("realloc(%p, %lud): out of memory", v, n);
        return v;
}

char*
struprcpy(char *p, char *s)
{
        char *op;

        op = p;
        for(; *s; s++)
                *p++ = toupper(*s);
        *p = '\0';

        return op;
}

int
chat(char *fmt, ...)
{
        va_list arg;

        if(!chatty)
                return 0;
        va_start(arg, fmt);
        vfprint(2, fmt, arg);
        va_end(arg);
        return 1;
}