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| | /*
* string.c - string manipulation
*
* This file is part of zsh, the Z shell.
*
* Copyright (c) 2000 Peter Stephenson
* All rights reserved.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and to distribute modified versions of this software for any
* purpose, provided that the above copyright notice and the following
* two paragraphs appear in all copies of this software.
*
* In no event shall Peter Stephenson or the Zsh Development Group be liable
* to any party for direct, indirect, special, incidental, or consequential
* damages arising out of the use of this software and its documentation,
* even if Peter Stephenson and the Zsh Development Group have been advised of
* the possibility of such damage.
*
* Peter Stephenson and the Zsh Development Group specifically disclaim any
* warranties, including, but not limited to, the implied warranties of
* merchantability and fitness for a particular purpose. The software
* provided hereunder is on an "as is" basis, and Peter Stephenson and the
* Zsh Development Group have no obligation to provide maintenance,
* support, updates, enhancements, or modifications.
*/
#include "zsh.mdh"
/**/
mod_export char *
dupstring(const char *s)
{
char *t;
if (!s)
return NULL;
t = (char *) zhalloc(strlen((char *)s) + 1);
strcpy(t, s);
return t;
}
/* Duplicate string on heap when length is known */
/**/
mod_export char *
dupstring_wlen(const char *s, unsigned len)
{
char *t;
if (!s)
return NULL;
t = (char *) zhalloc(len + 1);
memcpy(t, s, len);
t[len] = '\0';
return t;
}
/* Duplicate string on heap, returning length of string */
/**/
mod_export char *
dupstring_glen(const char *s, unsigned *len_ret)
{
char *t;
if (!s)
return NULL;
t = (char *) zhalloc((*len_ret = strlen((char *)s)) + 1);
strcpy(t, s);
return t;
}
/**/
mod_export char *
ztrdup(const char *s)
{
char *t;
if (!s)
return NULL;
t = (char *)zalloc(strlen((char *)s) + 1);
strcpy(t, s);
return t;
}
/**/
#ifdef MULTIBYTE_SUPPORT
/**/
mod_export wchar_t *
wcs_ztrdup(const wchar_t *s)
{
wchar_t *t;
if (!s)
return NULL;
t = (wchar_t *)zalloc(sizeof(wchar_t) * (wcslen((wchar_t *)s) + 1));
wcscpy(t, s);
return t;
}
/**/
#endif /* MULTIBYTE_SUPPORT */
/* concatenate s1, s2, and s3 in dynamically allocated buffer */
/**/
mod_export char *
tricat(char const *s1, char const *s2, char const *s3)
{
/* This version always uses permanently-allocated space. */
char *ptr;
size_t l1 = strlen(s1);
size_t l2 = strlen(s2);
ptr = (char *)zalloc(l1 + l2 + strlen(s3) + 1);
strcpy(ptr, s1);
strcpy(ptr + l1, s2);
strcpy(ptr + l1 + l2, s3);
return ptr;
}
/**/
mod_export char *
zhtricat(char const *s1, char const *s2, char const *s3)
{
char *ptr;
size_t l1, l2;
/* String duplicate fallback to prevent NULL derefs */
if (!s1 && !s2)
return dupstring(s3);
if (!s1)
l1 = 0, s1 = s2;
else
l1 = strlen(s1);
l2 = strlen(s2);
ptr = (char *)zhalloc(l1 + l2 + strlen(s3) + 1);
strcpy(ptr, s1);
strcpy(ptr + l1, s2);
strcpy(ptr + l1 + l2, s3);
return ptr;
}
/* concatenate s1 and s2 in dynamically allocated buffer */
/**/
mod_export char *
dyncat(const char *s1, const char *s2)
{
/* This version always uses space from the current heap. */
char *ptr;
size_t l1;
/* String duplicate fallback to prevent NULL derefs */
if (!s1)
return dupstring(s2);
l1 = strlen(s1);
ptr = (char *)zhalloc(l1 + strlen(s2) + 1);
strcpy(ptr, s1);
strcpy(ptr + l1, s2);
return ptr;
}
/**/
mod_export char *
bicat(const char *s1, const char *s2)
{
/* This version always uses permanently-allocated space. */
char *ptr;
size_t l1;
/* String duplicate fallback to prevent NULL derefs */
if (!s1)
return dupstring(s2);
l1 = strlen(s1);
ptr = (char *)zalloc(l1 + strlen(s2) + 1);
strcpy(ptr, s1);
strcpy(ptr + l1, s2);
return ptr;
}
/* like dupstring(), but with a specified length */
/**/
mod_export char *
dupstrpfx(const char *s, int len)
{
char *r = zhalloc(len + 1);
memcpy(r, s, len);
r[len] = '\0';
return r;
}
/**/
mod_export char *
ztrduppfx(const char *s, int len)
{
/* This version always uses permanently-allocated space. */
char *r = zalloc(len + 1);
memcpy(r, s, len);
r[len] = '\0';
return r;
}
/* Append a string to an allocated string, reallocating to make room. */
/**/
mod_export char *
appstr(char *base, char const *append)
{
return strcat(realloc(base, strlen(base) + strlen(append) + 1), append);
}
/* Return a pointer to the last character of a string,
unless the string is empty. */
/**/
mod_export char *
strend(char *str)
{
if (*str == '\0')
return str;
return str + strlen (str) - 1;
}
|