rpmio/strtolocale.c

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#include "system.h"
#include <langinfo.h>
#include <iconv.h>
#include "debug.h"

static char *locale_encoding = NULL;
static int locale_encoding_is_utf8;

const char * xstrtolocale(const char *str)
{
    iconv_t cd;
    size_t src_size, dest_size;
    char *result, *src, *dest;

    if (locale_encoding == NULL) {
        const char *encoding = nl_langinfo(CODESET);
        locale_encoding = xmalloc(strlen(encoding) + 11);
        sprintf(locale_encoding, "%s//TRANSLIT", encoding);
        locale_encoding_is_utf8 = strcasecmp(encoding, "UTF-8") == 0;
    }

    if (!str || !*str || locale_encoding_is_utf8)
        return str;

    cd = iconv_open(locale_encoding, "UTF-8");
    if (cd == (iconv_t)-1)
        return str;

    src_size = strlen(str);
    dest_size = src_size + 1;
    result = xmalloc(dest_size);
    src = (char *)str;
    dest = result;
    for(;;) {
        size_t status = iconv(cd, &src, &src_size, &dest, &dest_size);
        if (status == (size_t)-1) {
            size_t dest_offset;
            if (errno != E2BIG) {
                free(result);
                iconv_close(cd);
                return str;
            }
            dest_offset = dest - result;
            dest_size += 16;
            result = xrealloc(result, dest_offset + dest_size);
            dest = result + dest_offset;
        } else if (src_size == 0) {
            if (src == NULL) break;
            src = NULL;
        }
    }
    iconv_close(cd);
    free((void *)str);
    if (dest_size == 0) {
        size_t dest_offset = dest - result;
        result = xrealloc(result, dest_offset + 1);
        dest = result + dest_offset;
    }
    *dest = '\0';
    return result;
}

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