5 /* String handling <string.h>
7 This file is part of the Public Domain C Library (PDCLib).
8 Permission is granted to use, modify, and / or redistribute at will.
11 #ifndef _PDCLIB_STRING_H
12 #define _PDCLIB_STRING_H _PDCLIB_STRING_H
15 #define _PDCLIB_AUX_H _PDCLIB_AUX_H
16 #include <_PDCLIB_aux.h>
20 #define _PDCLIB_INT_H _PDCLIB_INT_H
21 #include <_PDCLIB_int.h>
24 #if _PDCLIB_HOSTED == 1
25 #warning As of the current release, PDCLib is not a conforming hosted environment.
26 #warning <string.h> is not standard-compliant (yet) - strerror is missing.
29 typedef _PDCLIB_size_t size_t;
31 #define NULL _PDCLIB_NULL
33 /* String function conventions */
36 In any of the following functions taking a size_t n to specify the length of
37 an array or size of a memory region, n may be 0, but the pointer arguments to
38 the call shall still be valid unless otherwise stated.
41 /* Copying functions */
43 /* Copy a number of n characters from the memory area pointed to by s2 to the
44 area pointed to by s1. If the two areas overlap, behaviour is undefined.
45 Returns the value of s1.
47 void * memcpy( void * _PDCLIB_restrict s1, const void * _PDCLIB_restrict s2, size_t n );
49 /* Copy a number of n characters from the memory area pointed to by s2 to the
50 area pointed to by s1. The two areas may overlap.
51 Returns the value of s1.
53 void * memmove( void * _PDCLIB_restrict s1, const void * _PDCLIB_restrict s2, size_t n );
55 /* Copy the character array s2 (including terminating '\0' byte) into the
57 Returns the value of s1.
59 char * strcpy( char * _PDCLIB_restrict s1, const char * _PDCLIB_restrict s2 );
61 /* Copy a maximum of n characters from the character array s2 into the character
62 array s1. If s2 is shorter than n characters, '\0' bytes will be appended to
63 the copy in s1 until n characters have been written. If s2 is longer than n
64 characters, NO terminating '\0' will be written to s1. If the arrays overlap,
65 behaviour is undefined.
66 Returns the value of s1.
68 char * strncpy( char * _PDCLIB_restrict s1, const char * _PDCLIB_restrict s2, size_t n );
70 /* Concatenation functions */
72 /* Append the contents of the character array s2 (including terminating '\0') to
73 the character array s1 (first character of s2 overwriting the '\0' of s1). If
74 the arrays overlap, behaviour is undefined.
75 Returns the value of s1.
77 char * strcat( char * _PDCLIB_restrict s1, const char * _PDCLIB_restrict s2 );
79 /* Append a maximum of n characters from the character array s1 to the character
80 array s1 (first character of s2 overwriting the '\0' of s1). A terminating
81 '\0' is ALWAYS appended, even if the full n characters have already been
82 written. If the arrays overlap, behaviour is undefined.
83 Returns the value of s1.
85 char * strncat( char * _PDCLIB_restrict s1, const char * _PDCLIB_restrict s2, size_t n );
87 /* Comparison functions */
89 /* Compare the first n characters of the memory areas pointed to by s1 and s2.
90 Returns 0 if s1 == s2, a negative number if s1 < s2, and a positive number if
93 int memcmp( const void * s1, const void * s2, size_t n );
95 /* Compare the character arrays s1 and s2.
96 Returns 0 if s1 == s2, a negative number if s1 < s2, and a positive number if
99 int strcmp( const char * s1, const char * s2 );
101 /* Compare the character arrays s1 and s2, interpreted as specified by the
102 LC_COLLATE category of the current locale.
103 Returns 0 if s1 == s2, a negative number if s1 < s2, and a positive number if
105 TODO: Currently a dummy wrapper for strcmp() as PDCLib does not yet support
108 int strcoll( const char * s1, const char * s2 );
110 /* Compare no more than the first n characters of the character arrays s1 and
112 Returns 0 if s1 == s2, a negative number if s1 < s2, and a positive number if
115 int strncmp( const char * s1, const char * s2, size_t n );
117 /* Transform the character array s2 as appropriate for the LC_COLLATE setting of
118 the current locale. If length of resulting string is less than n, store it in
119 the character array pointed to by s1. Return the length of the resulting
122 size_t strxfrm( char * _PDCLIB_restrict s1, const char * _PDCLIB_restrict s2, size_t n );
124 /* Search functions */
126 /* Search the first n characters in the memory area pointed to by s for the
127 character c (interpreted as unsigned char).
128 Returns a pointer to the first instance found, or NULL.
130 void * memchr( const void * s, int c, size_t n );
132 /* Search the character array s (including terminating '\0') for the character c
133 (interpreted as char).
134 Returns a pointer to the first instance found, or NULL.
136 char * strchr( const char * s, int c );
138 /* Determine the length of the initial substring of character array s1 which
139 consists only of characters not from the character array s2.
140 Returns the length of that substring.
142 size_t strcspn( const char * s1, const char * s2 );
144 /* Search the character array s1 for any character from the character array s2.
145 Returns a pointer to the first occurrence, or NULL.
147 char * strpbrk( const char * s1, const char * s2 );
149 /* Search the character array s (including terminating '\0') for the character c
150 (interpreted as char).
151 Returns a pointer to the last instance found, or NULL.
153 char * strrchr( const char * s, int c );
155 /* Determine the length of the initial substring of character array s1 which
156 consists only of characters from the character array s2.
157 Returns the length of that substring.
159 size_t strspn( const char * s1, const char * s2 );
161 /* Search the character array s1 for the substring in character array s2.
162 Returns a pointer to that sbstring, or NULL. If s2 is of length zero,
165 char * strstr( const char * s1, const char * s2 );
167 /* In a series of subsequent calls, parse a C string into tokens.
168 On the first call to strtok(), the first argument is a pointer to the to-be-
169 parsed C string. On subsequent calls, the first argument is NULL unless you
170 want to start parsing a new string. s2 holds an array of seperator characters
171 which can differ from call to call. Leading seperators are skipped, the first
172 trailing seperator overwritten with '\0'.
173 Returns a pointer to the next token.
174 WARNING: This function uses static storage, and as such is not reentrant.
176 char * strtok( char * _PDCLIB_restrict s1, const char * _PDCLIB_restrict s2 );
178 /* Miscellaneous functions */
180 /* Write the character c (interpreted as unsigned char) to the first n
181 characters of the memory area pointed to by s.
184 void * memset( void * s, int c, size_t n );
186 /* Map an error number to a (locale-specific) error message string. Error
187 numbers are typically errno values, but any number is mapped to a message.
188 TODO: PDCLib does not yet support locales.
189 TODO: strerror() not yet implemented.
190 char * strerror( int errnum );
193 /* Returns the length of the string s (excluding terminating '\0').
195 size_t strlen( const char * s );