/*
 strfuncs.c : String manipulation functions

    Copyright (c) 2002 Timo Sirainen

    Permission is hereby granted, free of charge, to any person obtaining
    a copy of this software and associated documentation files (the
    "Software"), to deal in the Software without restriction, including
    without limitation the rights to use, copy, modify, merge, publish,
    distribute, sublicense, and/or sell copies of the Software, and to
    permit persons to whom the Software is furnished to do so, subject to
    the following conditions:

    The above copyright notice and this permission notice shall be
    included in all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
    IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
    CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
    TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
    SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

/* @UNSAFE: whole file */

#include "lib.h"
#include "printf-upper-bound.h"
#include "strfuncs.h"

#include <stdio.h>
#include <limits.h>
#include <ctype.h>

#define STRCONCAT_BUFSIZE 512

static const char *fix_format_real(const char *fmt, const char *p)
{
	const char *errstr;
	char *buf;
	size_t pos, alloc, errlen;

	errstr = strerror(errno);
	errlen = strlen(errstr);

	pos = (size_t) (p-fmt);
	i_assert(pos < SSIZE_T_MAX);

	alloc = pos + errlen + 128;
	buf = t_buffer_get(alloc);

	memcpy(buf, fmt, pos);

	while (*p != '\0') {
		if (*p == '%' && p[1] == 'm') {
			if (pos+errlen+1 > alloc) {
				alloc += errlen+1 + 128;
				buf = t_buffer_get(alloc);
			}

			memcpy(buf+pos, errstr, errlen);
			pos += errlen;
			p += 2;
		} else {
			/* p + \0 */
			if (pos+2 > alloc) {
				alloc += 128;
				buf = t_buffer_get(alloc);
			}

			buf[pos++] = *p;
			p++;
		}
	}

	buf[pos++] = '\0';
	t_buffer_alloc(pos);
	return buf;
}

/* replace %m with strerror() */
const char *printf_string_fix_format(const char *fmt)
{
	const char *p;

	for (p = fmt; *p != '\0'; p++) {
		if (*p == '%' && p[1] == 'm')
			return fix_format_real(fmt, p);
	}

	return fmt;
}

int i_snprintf(char *dest, size_t max_chars, const char *format, ...)
{
#ifndef HAVE_VSNPRINTF
	char *buf;
#endif
	va_list args, args2;
	ssize_t len;
	int ret;

	i_assert(max_chars < INT_MAX);

	t_push();

	va_start(args, format);
	VA_COPY(args2, args);

	format = printf_string_fix_format(format);
	len = printf_string_upper_bound(format, args);

	i_assert(len >= 0);

#ifdef HAVE_VSNPRINTF
	len = vsnprintf(dest, max_chars, format, args2);
#else
	buf = t_buffer_get(len);
	len = vsprintf(buf, format, args2);
#endif
	va_end(args);

	if (len < 0) {
		/* some error occured */
		len = 0;
		ret = -1;
	} else if ((size_t)len >= max_chars) {
		/* too large */
		len = max_chars-1;
		ret = -1;
	} else {
		ret = 0;
	}

#ifndef HAVE_VSNPRINTF
	memcpy(dest, buf, len);
#endif
	dest[len] = '\0';

	t_pop();
	return ret;
}

char *p_strdup(Pool pool, const char *str)
{
	void *mem;
	size_t len;

	if (str == NULL)
                return NULL;

	for (len = 0; (str)[len] != '\0'; )
		len++;
	len++;

	mem = p_malloc(pool, len);
	memcpy(mem, str, len);
	return mem;
}

char *p_strdup_empty(Pool pool, const char *str)
{
	if (str == NULL || *str == '\0')
                return NULL;

	return p_strdup(pool, str);
}

char *p_strdup_until(Pool pool, const char *start, const char *end)
{
	size_t size;
	char *mem;

	i_assert(start <= end);

	size = (size_t) (end-start);

	mem = p_malloc(pool, size + 1);
	memcpy(mem, start, size);
	return mem;
}

char *p_strndup(Pool pool, const char *str, size_t max_chars)
{
	char *mem;
	size_t len;

	i_assert(max_chars != (size_t)-1);

	if (str == NULL)
		return NULL;

	len = 0;
	while (str[len] != '\0' && len < max_chars)
		len++;

	mem = pool->malloc(pool, len+1);
	memcpy(mem, str, len);
	mem[len] = '\0';
	return mem;
}

char *p_strdup_printf(Pool pool, const char *format, ...)
{
	va_list args;
        char *ret;

	va_start(args, format);
        ret = p_strdup_vprintf(pool, format, args);
	va_end(args);

	return ret;
}

char *p_strdup_vprintf(Pool pool, const char *format, va_list args)
{
	char *ret;
	va_list args2;
	size_t len;

	i_assert(format != NULL);

	if (pool != data_stack_pool)
		t_push();

	VA_COPY(args2, args);

	format = printf_string_fix_format(format);

	len = printf_string_upper_bound(format, args);
        ret = p_malloc(pool, len);

#ifdef HAVE_VSNPRINTF
	vsnprintf(ret, len, format, args2);
#else
	vsprintf(ret, format, args2);
#endif
	if (pool != data_stack_pool)
		t_pop();
	return ret;
}

const char *_vstrconcat(const char *str1, va_list args, size_t *ret_len)
{
	const char *str;
        char *temp, *temp_end, *p;
	size_t bufsize, pos;

	if (str1 == NULL)
		return NULL;

	str = str1;
	bufsize = STRCONCAT_BUFSIZE;
	temp = t_buffer_get(bufsize);

	pos = 0;
	do {
		temp_end = temp + bufsize - 1; /* leave 1 for \0 */

		p = temp + pos;
		while (*str != '\0' && p != temp_end)
			*p++ = *str++;
		pos = (size_t)(p - temp);

		if (p == temp_end) {
			/* need more memory */
			bufsize = nearest_power(bufsize+1);
			temp = t_buffer_reget(temp, bufsize);
		} else {
			/* next string */
			str = va_arg(args, const char *);
		}
	} while (str != NULL);

	i_assert(pos < bufsize);

	temp[pos] = '\0';
        *ret_len = pos+1;
        return temp;
}

char *p_strconcat(Pool pool, const char *str1, ...)
{
	va_list args;
        const char *temp;
	char *ret;
        size_t len;

	va_start(args, str1);

	temp = _vstrconcat(str1, args, &len);
	if (temp == NULL)
		ret = NULL;
	else {
		ret = p_malloc(pool, len);
		memcpy(ret, temp, len);
	}

	va_end(args);
        return ret;
}

const char *t_strdup(const char *str)
{
	return p_strdup(data_stack_pool, str);
}

char *t_strdup_noconst(const char *str)
{
	return p_strdup(data_stack_pool, str);
}

const char *t_strdup_empty(const char *str)
{
	return p_strdup_empty(data_stack_pool, str);
}

const char *t_strdup_until(const char *start, const char *end)
{
	return p_strdup_until(data_stack_pool, start, end);
}

const char *t_strndup(const char *str, size_t max_chars)
{
	return p_strndup(data_stack_pool, str, max_chars);
}

const char *t_strdup_printf(const char *format, ...)
{
	va_list args;
	const char *ret;

	va_start(args, format);
	ret = p_strdup_vprintf(data_stack_pool, format, args);
	va_end(args);

	return ret;
}

const char *t_strdup_vprintf(const char *format, va_list args)
{
	return p_strdup_vprintf(data_stack_pool, format, args);
}

const char *t_strconcat(const char *str1, ...)
{
	va_list args;
	const char *ret;
        size_t len;

	va_start(args, str1);

	ret = _vstrconcat(str1, args, &len);
	if (ret != NULL)
		t_buffer_alloc(len);

	va_end(args);
        return ret;
}

const char *t_strcut(const char *str, char cutchar)
{
	const char *p;

	for (p = str; *p != '\0'; p++) {
		if (*p == cutchar)
                        return t_strdup_until(str, p);
	}

        return str;
}

int is_numeric(const char *str, char end_char)
{
	if (*str == '\0' || *str == end_char)
		return FALSE;

	while (*str != '\0' && *str != end_char) {
		if (!i_isdigit(*str))
			return FALSE;
		str++;
	}

	return TRUE;
}

int strocpy(char *dest, const char *src, size_t dstsize)
{
	if (dstsize == 0)
		return -1;

	while (*src != '\0' && dstsize > 1) {
		*dest++ = *src++;
		dstsize--;
	}

	*dest++ = '\0';
	return *src == '\0' ? 0 : -1;
}

int str_path(char *dest, size_t dstsize, const char *dir, const char *file)
{
	size_t dirlen, filelen;

	dirlen = strlen(dir);
	filelen = strlen(file);

	if (dirlen+1+filelen >= dstsize) {
		if (dstsize > 0)
			*dest = '\0';
		errno = ENAMETOOLONG;
		return -1;
	}

	memcpy(dest, dir, dirlen);
	dest[dirlen] = '/';
	memcpy(dest + dirlen + 1, file, filelen);
	dest[dirlen + 1 + filelen] = '\0';
	return 0;
}

int str_ppath(char *dest, size_t dstsize, const char *dir,
	      const char *file_prefix, const char *file)
{
	size_t dirlen, prefixlen, filelen;

	dirlen = strlen(dir);
	prefixlen = strlen(file_prefix);
	filelen = strlen(file);

	if (dirlen+1+prefixlen+filelen >= dstsize) {
		if (dstsize > 0)
			*dest = '\0';
		errno = ENAMETOOLONG;
		return -1;
	}

	memcpy(dest, dir, dirlen);
	dest[dirlen] = '/';
	memcpy(dest + dirlen + 1, file_prefix, prefixlen);
	memcpy(dest + dirlen + prefixlen + 1, file, filelen);
	dest[dirlen + 1 + prefixlen + filelen] = '\0';
	return 0;
}

char *str_ucase(char *str)
{
	char *p;

	for (p = str; *p != '\0'; p++)
		*p = i_toupper(*p);
        return str;
}

char *str_lcase(char *str)
{
	char *p;

	for (p = str; *p != '\0'; p++)
		*p = i_tolower(*p);
        return str;
}

const char **t_strsplit(const char *data, const char *separators)
{
        const char **array;
	char *str;
        size_t alloc_len, len;

        i_assert(*separators != '\0');

	str = t_strdup_noconst(data);

        alloc_len = 32;
        array = t_buffer_get(sizeof(const char *) * alloc_len);

	array[0] = str; len = 1;
	while (*str != '\0') {
		if (strchr(separators, *str) != NULL) {
			/* separator found */
			if (len+1 >= alloc_len) {
                                alloc_len = nearest_power(alloc_len+1);
				array = t_buffer_reget(array,
						       sizeof(const char *) *
						       alloc_len);
			}

                        *str = '\0';
			array[len++] = str+1;
		}

                str++;
	}

	i_assert(len < alloc_len);
        array[len] = NULL;

	t_buffer_alloc(sizeof(const char *) * (len+1));
        return array;
}

const char *dec2str(uintmax_t number)
{
	char *buffer;
	int pos;

	pos = MAX_INT_STRLEN;
	buffer = t_malloc(pos);

	buffer[--pos] = '\0';
	do {
		buffer[--pos] = (number % 10) + '0';
		number /= 10;
	} while (number != 0 && pos >= 0);

	i_assert(pos >= 0);
	return buffer + pos;
}