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/*
* memutil.c - Utility functions for dynamic memory allocation
*
* Written 2001,2002 by Werner Almesberger
* Copyright 2001 EPFL-ICA
* Copyright 2001,2002 Bivio Networks, Network Robots
*/
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <unistd.h>
#include <assert.h>
#include "memutil.h"
/* ----- Malloc wrappers --------------------------------------------------- */
void *alloc(size_t size)
{
void *new;
new = malloc(size);
if (new) return new;
perror("malloc");
exit(1);
}
char *stralloc(const char *s)
{
char *new;
new = strdup(s);
if (new) return new;
perror("strdup");
exit(1);
}
/* ----- "Safe" sprintf ---------------------------------------------------- */
int log_8(unsigned long value)
{
int len;
if (!value) return 1;
for (len = 0; value; value /= 8) len++;
return len;
}
int log_10(unsigned long value)
{
int len;
if (!value) return 1;
for (len = 0; value; value /= 10) len++;
return len;
}
int log_16(unsigned long value)
{
int len;
if (!value) return 1;
for (len = 0; value; value /= 16) len++;
return len;
}
char *alloc_sprintf(const char *fmt,...)
{
va_list ap;
const char *s;
char *buf;
int total,real_len;
total = 0;
va_start(ap,fmt);
for (s = fmt; *s; s++)
if (*s != '%') total++;
else {
int len = 0,min = 0;
s++;
if (isdigit(*s)) {
char *end;
min = strtoul(s,&end,10);
s = end;
}
if (*s == '*') {
min = va_arg(ap,int);
s++;
}
if (*s == '.') {
if (s[1] != '*' || s[2] != 's') abort();
len = va_arg(ap,int);
real_len = strlen(va_arg(ap,char *));
if (real_len < len) len = real_len;
s += 2;
}
else {
int tmp;
switch (*s) {
case 'c':
(void) va_arg(ap,int); /* converted from char */
len = 1;
break;
case 's':
len = strlen(va_arg(ap,char *));
break;
case 'd':
tmp = va_arg(ap,int);
if (tmp < 0) {
tmp = -tmp;
len++;
}
len += log_10(tmp);
break;
case 'u':
len = log_10(va_arg(ap,unsigned));
break;
case 'x':
len = log_16(va_arg(ap,unsigned));
break;
case '%':
len = 1;
break;
default:
abort();
}
}
total += len < min ? min : len;
}
va_end(ap);
buf = alloc(total+1);
va_start(ap,fmt);
real_len = vsprintf(buf,fmt,ap);
va_end(ap);
assert(real_len == total);
return buf;
}
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