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#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <ctype.h>
#include <string.h>
#include "mstring.h"
/* parameters about string length. START is the starting size and
** START+TAIL should be a power of two */
#define START 24
#define TAIL 8
void msprintf(struct mstring *s, const char *fmt, ...)
{
static char buf[4096]; /* a big static buffer */
va_list args;
int len;
if (!s || !s->base) return;
va_start(args, fmt);
vsprintf(buf, fmt, args);
va_end(args);
len = strlen(buf);
if (len > (s->end - s->ptr)) {
int cp = s->ptr - s->base, cl = s->end - s->base, nl = cl;
while (len > (nl - cp))
nl = nl + nl + TAIL;
if ((s->base = realloc(s->base, nl))) {
s->ptr = s->base + cp;
s->end = s->base + nl; }
else {
s->ptr = s->end = 0;
return; } }
memcpy(s->ptr, buf, len);
s->ptr += len;
}
int mputchar(struct mstring *s, int ch)
{
if (!s || !s->base) return ch;
if (s->ptr == s->end) {
int len = s->end - s->base;
if ((s->base = realloc(s->base, len+len+TAIL))) {
s->ptr = s->base + len;
s->end = s->base + len+len+TAIL; }
else {
s->ptr = s->end = 0;
return ch; } }
*s->ptr++ = ch;
return ch;
}
struct mstring *msnew(void) {
struct mstring *n = malloc(sizeof(struct mstring));
if (n && (n->base = n->ptr = malloc(START)))
n->end = n->base + START;
else if (n) {
free(n);
n = 0; }
return n;
}
char *msdone(struct mstring *s)
{
char *r = 0;
if (s) {
mputc(s, 0);
r = s->base;
free(s); }
return r;
}
/* compare two strings, ignoring whitespace, except between two letters or
** digits (and treat all of these as equal) */
int strnscmp(const char *a, const char *b)
{
while(1) {
while (isspace(*a)) a++;
while (isspace(*b)) b++;
while (*a && *a == *b) a++,b++;
if (isspace(*a)) {
if (isalnum(a[-1]) && isalnum(*b))
break; }
else if (isspace(*b)) {
if (isalnum(b[-1]) && isalnum(*a))
break; }
else
break; }
return *a - *b;
}
unsigned int strnshash(const char *s)
{
unsigned int h = 0;
while (*s) {
if (!isspace(*s))
h = (h<<5) - h + *s;
s++; }
return h;
}
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