Cytoplasm/src/include/Str.h

130 lines
4.5 KiB
C
Raw Normal View History

/*
* Copyright (C) 2022-2023 Jordan Bancino <@jordan:bancino.net>
*
* 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 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.
*/
#ifndef CYTOPLASM_STR_H
#define CYTOPLASM_STR_H
/***
* @Nm Str
* @Nd Functions for creating and manipulating strings.
* @Dd February 15 2023
* @Xr Memory
*
* .Nm
* provides string-related functions. It is called
* .Nm ,
* not String, because some platforms (Windows) do not have
* case-sensitive filesystems, which poses a problem since
* .Pa string.h
* is a standard library header.
*/
#include <Int.h>
#include <stddef.h>
/**
* Convert UTF-16 into a Unicode codepoint.
*/
extern UInt32 StrUtf16Decode(UInt16, UInt16);
/**
* Take a Unicode codepoint and encode it into a string buffer containing
* between 1 and 4 bytes. The string buffer is allocated on the heap,
* so it should be freed when it is no longer needed.
*/
extern char * StrUtf8Encode(UInt32);
/**
* Duplicate a null-terminated string, returning a new string on the
* heap. This is useful when a function takes in a string that it needs
* to store for long amounts of time, even perhaps after the original
* string is gone.
*/
extern char * StrDuplicate(const char *);
/**
* Extract part of a null-terminated string, returning a new string on
* the heap containing only the requested subsection. Like the
* substring functions included with most programming languages, the
* starting index is inclusive, and the ending index is exclusive.
*/
extern char * StrSubstr(const char *, size_t, size_t);
/**
* A varargs function that takes a number of null-terminated strings
* specified by the first argument, and returns a new string that
* contains their concatenation. It works similarly to
* .Xr strcat 3 ,
* but it takes care of allocating memory big enough to hold all the
* strings. Any string in the list may be NULL. If a NULL pointer is
* passed, it is treated like an empty string.
*/
extern char * StrConcat(size_t,...);
/**
* Return a boolean value indicating whether or not the null-terminated
* string consists only of blank characters, as determined by
* .Xr isblank 3 .
*/
extern int StrBlank(const char *str);
/**
* Generate a string of the specified length, containing random
* lowercase and uppercase letters.
*/
extern char * StrRandom(size_t);
/**
* Convert the specified integer into a string, returning the string
* on the heap, or NULL if there was a memory allocation error. The
* returned string should be freed by the caller after it is no longer
* needed.
*/
extern char * StrInt(long);
2023-06-12 14:10:59 +00:00
/**
* Converts a string into a lowercase version of it using
* .Xr tolower 3 ,
* returning the lowercase version on the heap, or NULL if there was
* a memory allocation error. The returned string should be freed by
* the caller after it is no longer needed.
*/
extern char * StrLower(char *);
/**
* Compare two strings and determine whether or not they are equal.
* This is the most common use case of strcmp() in Cytoplasm, but
* strcmp() doesn't like NULL pointers, so these have to be checked
* explicitly and can cause problems if they aren't. This function,
* on the other hand, makes NULL pointers special cases. If both
* arguments are NULL, then they are considered equal. If only one
* argument is NULL, they are considered not equal. Otherwise, if
* no arguments are NULL, a regular strcmp() takes place and this
* function returns a boolean value indicating whether or not
* strcmp() returned 0.
*/
extern int StrEquals(const char *, const char *);
#endif /* CYTOPLASM_STR_H */