duk_codepage_conv.c File Reference

#include "duktape.h"

Go to the source code of this file.

Functions
void	duk_decode_string_codepage (duk_context *ctx, const char *str, size_t len, unsigned int *codepage)

Function Documentation

duk_decode_string_codepage()

void duk_decode_string_codepage	(	duk_context *	ctx,
		const char *	str,
		size_t	len,
		unsigned int *	codepage )

Definition at line 17 of file duktape-1.8.0/examples/codepage-conv/duk_codepage_conv.c.

                                                                                                       {
    unsigned char *tmp;
    size_t tmplen, i;
    unsigned char *p;
    unsigned int cp;
 
    tmplen = 3 * len;  /* max expansion is 1 input byte -> 3 output bytes */
    if (tmplen / 3 != len) {
        /* Temporary buffer length wraps. */
        duk_error(ctx, DUK_ERR_RANGE_ERROR, "input string too long");
        return;
    }
 
    tmp = (unsigned char *) duk_push_fixed_buffer(ctx, tmplen);
 
    for (i = 0, p = tmp; i < len; i++) {
        cp = codepage[((unsigned char *) str)[i]] & 0xffffUL;
        if (cp < 0x80UL) {
            *p++ = (unsigned char) cp;
        } else if (cp < 0x800UL) {
            *p++ = (unsigned char) (0xc0 + ((cp >> 6) & 0x1f));
            *p++ = (unsigned char) (0x80 + (cp & 0x3f));
        } else {
            /* In CESU-8 all codepoints in [0x0000,0xFFFF] are
             * allowed, including surrogates.
             */
            *p++ = (unsigned char) (0xe0 + ((cp >> 12) & 0x0f));
            *p++ = (unsigned char) (0x80 + ((cp >> 6) & 0x3f));
            *p++ = (unsigned char) (0x80 + (cp & 0x3f));
        }
    }
 
    duk_push_lstring(ctx, (const char *) tmp, (duk_size_t) (p - tmp));
 
    /* [ ... tmp res ] */
 
    duk_remove(ctx, -2);
}

References DUK_ERR_RANGE_ERROR, duk_error, duk_push_fixed_buffer, duk_push_lstring(), and duk_remove().