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string.h File Reference

Optimized string handling code, including c11-compliant "safe C library" variants. More...

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Macros

#define clib_memcpy_fast(a, b, c)   memcpy(a,b,c)
 
#define EINVAL   22
 
#define ESRCH   3
 
#define EOVERFLOW   75
 
#define CLIB_STRING_MACRO_MAX   4096
 
#define clib_memcpy(d, s, n)   memcpy_s_inline(d,n,s,n)
 
#define clib_memset(s, c, n)   memset_s_inline(s,n,c,n)
 
#define clib_memcmp(s1, s2, m1)
 
#define clib_strnlen(s, m)   strnlen_s_inline(s,m)
 
#define clib_strcmp(s1, s2)
 
#define clib_strncmp(s1, s2, n)
 
#define clib_strcpy(d, s)   strcpy_s_inline(d,CLIB_STRING_MACRO_MAX,s)
 
#define clib_strncpy(d, s, n)   strncpy_s_inline(d,CLIB_STRING_MACRO_MAX,s,n)
 
#define clib_strcat(d, s)   strcat_s_inline(d,CLIB_STRING_MACRO_MAX,s)
 
#define clib_strncat(d, s, n)   strncat_s_inline(d,CLIB_STRING_MACRO_MAX,s,n)
 
#define clib_strtok(s1, s2, p)
 
#define STRTOK_DELIM_MAX_LEN   16
 
#define clib_strstr(s1, s2)
 

Typedefs

typedef int errno_t
 
typedef uword rsize_t
 

Functions

void clib_memswap (void *_a, void *_b, uword bytes)
 
void clib_c11_violation (const char *s)
 
errno_t memcpy_s (void *__restrict__ dest, rsize_t dmax, const void *__restrict__ src, rsize_t n)
 copy src to dest, at most n bytes, up to dmax More...
 
static errno_t memcpy_s_inline (void *__restrict__ dest, rsize_t dmax, const void *__restrict__ src, rsize_t n)
 
errno_t memset_s (void *s, rsize_t smax, int c, rsize_t n)
 set n bytes starting at s to the specified c value More...
 
static errno_t memset_s_inline (void *s, rsize_t smax, int c, rsize_t n)
 
static_always_inline void clib_memcpy_le (u8 *dst, u8 *src, u8 len, u8 max_len)
 
static_always_inline void clib_memcpy_le64 (u8 *dst, u8 *src, u8 len)
 
static_always_inline void clib_memcpy_le32 (u8 *dst, u8 *src, u8 len)
 
static_always_inline void clib_memset_u64 (void *p, u64 val, uword count)
 
static_always_inline void clib_memset_u32 (void *p, u32 val, uword count)
 
static_always_inline void clib_memset_u16 (void *p, u16 val, uword count)
 
static_always_inline void clib_memset_u8 (void *p, u8 val, uword count)
 
static_always_inline uword clib_count_equal_u64 (u64 *data, uword max_count)
 
static_always_inline uword clib_count_equal_u32 (u32 *data, uword max_count)
 
static_always_inline uword clib_count_equal_u16 (u16 *data, uword max_count)
 
static_always_inline uword clib_count_equal_u8 (u8 *data, uword max_count)
 
errno_t memcmp_s (const void *s1, rsize_t s1max, const void *s2, rsize_t s2max, int *diff)
 compare memory until they differ, and their difference is returned in diff More...
 
static errno_t memcmp_s_inline (const void *s1, rsize_t s1max, const void *s2, rsize_t s2max, int *diff)
 
size_t strnlen_s (const char *s, size_t maxsize)
 compute the length in s, no more than maxsize More...
 
static size_t strnlen_s_inline (const char *s, size_t maxsize)
 
errno_t strcmp_s (const char *s1, rsize_t s1max, const char *s2, int *indicator)
 compare string s2 to string s1, and their difference is returned in indicator More...
 
static errno_t strcmp_s_inline (const char *s1, rsize_t s1max, const char *s2, int *indicator)
 
errno_t strncmp_s (const char *s1, rsize_t s1max, const char *s2, rsize_t n, int *indicator)
 compare string s2 to string s1, no more than n characters, and their difference is returned in indicator More...
 
static errno_t strncmp_s_inline (const char *s1, rsize_t s1max, const char *s2, rsize_t n, int *indicator)
 
errno_t strcpy_s (char *__restrict__ dest, rsize_t dmax, const char *__restrict__ src)
 copy src string to dest string More...
 
static errno_t strcpy_s_inline (char *__restrict__ dest, rsize_t dmax, const char *__restrict__ src)
 
errno_t strncpy_s (char *__restrict__ dest, rsize_t dmax, const char *__restrict__ src, rsize_t n)
 copy src string to dest string, no more than n characters More...
 
static errno_t strncpy_s_inline (char *__restrict__ dest, rsize_t dmax, const char *__restrict__ src, rsize_t n)
 
errno_t strcat_s (char *__restrict__ dest, rsize_t dmax, const char *__restrict__ src)
 append src string to dest string, including null More...
 
static errno_t strcat_s_inline (char *__restrict__ dest, rsize_t dmax, const char *__restrict__ src)
 
errno_t strncat_s (char *__restrict__ dest, rsize_t dmax, const char *__restrict__ src, rsize_t n)
 append src string to dest string, including null, no more than n characters More...
 
static errno_t strncat_s_inline (char *__restrict__ dest, rsize_t dmax, const char *__restrict__ src, rsize_t n)
 
char * strtok_s (char *__restrict__ s1, rsize_t *__restrict__ s1max, const char *__restrict__ s2, char **__restrict__ ptr)
 tokenize string s1 with delimiter specified in s2. More...
 
static char * strtok_s_inline (char *__restrict__ s1, rsize_t *__restrict__ s1max, const char *__restrict__ s2, char **__restrict__ ptr)
 
errno_t strstr_s (char *s1, rsize_t s1max, const char *s2, rsize_t s2max, char **substring)
 locate the first occurrence of the substring s2 in s1 More...
 
static errno_t strstr_s_inline (char *s1, rsize_t s1max, const char *s2, rsize_t s2max, char **substring)
 

Detailed Description

Optimized string handling code, including c11-compliant "safe C library" variants.

Definition in file string.h.

Macro Definition Documentation

#define clib_memcmp (   s1,
  s2,
  m1 
)
Value:
({ int __diff = 0; \
memcmp_s_inline (s1, m1, s2, m1, &__diff); \
__diff; \
})
static errno_t memcmp_s_inline(const void *s1, rsize_t s1max, const void *s2, rsize_t s2max, int *diff)
Definition: string.h:747

Definition at line 737 of file string.h.

#define clib_memcpy (   d,
  s,
 
)    memcpy_s_inline(d,n,s,n)

Definition at line 180 of file string.h.

#define clib_memcpy_fast (   a,
  b,
  c 
)    memcpy(a,b,c)

Definition at line 81 of file string.h.

#define clib_memset (   s,
  c,
 
)    memset_s_inline(s,n,c,n)

Definition at line 214 of file string.h.

#define clib_strcat (   d,
 
)    strcat_s_inline(d,CLIB_STRING_MACRO_MAX,s)

Definition at line 1074 of file string.h.

#define clib_strcmp (   s1,
  s2 
)
Value:
({ int __indicator = 0; \
strcmp_s_inline (s1, CLIB_STRING_MACRO_MAX, s2, &__indicator); \
__indicator; \
})
static errno_t strcmp_s_inline(const char *s1, rsize_t s1max, const char *s2, int *indicator)
Definition: string.h:836
#define CLIB_STRING_MACRO_MAX
Definition: string.h:111

Definition at line 826 of file string.h.

#define clib_strcpy (   d,
 
)    strcpy_s_inline(d,CLIB_STRING_MACRO_MAX,s)

Definition at line 938 of file string.h.

#define CLIB_STRING_MACRO_MAX   4096

Definition at line 111 of file string.h.

#define clib_strncat (   d,
  s,
 
)    strncat_s_inline(d,CLIB_STRING_MACRO_MAX,s,n)

Definition at line 1135 of file string.h.

#define clib_strncmp (   s1,
  s2,
 
)
Value:
({ int __indicator = 0; \
strncmp_s_inline (s1, CLIB_STRING_MACRO_MAX, s2, n, &__indicator); \
__indicator; \
})
#define CLIB_STRING_MACRO_MAX
Definition: string.h:111
static errno_t strncmp_s_inline(const char *s1, rsize_t s1max, const char *s2, rsize_t n, int *indicator)
Definition: string.h:890

Definition at line 880 of file string.h.

#define clib_strncpy (   d,
  s,
 
)    strncpy_s_inline(d,CLIB_STRING_MACRO_MAX,s,n)

Definition at line 995 of file string.h.

#define clib_strnlen (   s,
 
)    strnlen_s_inline(s,m)

Definition at line 785 of file string.h.

#define clib_strstr (   s1,
  s2 
)
Value:
({ char * __substring = 0; \
&__substring); \
__substring; \
})
#define CLIB_STRING_MACRO_MAX
Definition: string.h:111
static errno_t strstr_s_inline(char *s1, rsize_t s1max, const char *s2, rsize_t s2max, char **substring)
Definition: string.h:1377

Definition at line 1366 of file string.h.

#define clib_strtok (   s1,
  s2,
 
)
Value:
strtok_s_inline (s1, &__s1max, s2, p); \
})
#define CLIB_STRING_MACRO_MAX
Definition: string.h:111
static char * strtok_s_inline(char *__restrict__ s1, rsize_t *__restrict__ s1max, const char *__restrict__ s2, char **__restrict__ ptr)
Definition: string.h:1223
uword rsize_t
Definition: string.h:114

Definition at line 1214 of file string.h.

#define EINVAL   22

Definition at line 93 of file string.h.

#define EOVERFLOW   75

Definition at line 99 of file string.h.

#define ESRCH   3

Definition at line 96 of file string.h.

#define STRTOK_DELIM_MAX_LEN   16

Typedef Documentation

typedef int errno_t

Definition at line 113 of file string.h.

typedef uword rsize_t

Definition at line 114 of file string.h.

Function Documentation

void clib_c11_violation ( const char *  s)

Definition at line 95 of file string.c.

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static_always_inline uword clib_count_equal_u16 ( u16 data,
uword  max_count 
)

Definition at line 588 of file string.h.

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static_always_inline uword clib_count_equal_u32 ( u32 data,
uword  max_count 
)

Definition at line 520 of file string.h.

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static_always_inline uword clib_count_equal_u64 ( u64 data,
uword  max_count 
)

Definition at line 470 of file string.h.

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static_always_inline uword clib_count_equal_u8 ( u8 data,
uword  max_count 
)

Definition at line 656 of file string.h.

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static_always_inline void clib_memcpy_le ( u8 dst,
u8 src,
u8  len,
u8  max_len 
)

Definition at line 217 of file string.h.

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static_always_inline void clib_memcpy_le32 ( u8 dst,
u8 src,
u8  len 
)

Definition at line 289 of file string.h.

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static_always_inline void clib_memcpy_le64 ( u8 dst,
u8 src,
u8  len 
)

Definition at line 283 of file string.h.

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static_always_inline void clib_memset_u16 ( void *  p,
u16  val,
uword  count 
)

Definition at line 378 of file string.h.

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static_always_inline void clib_memset_u32 ( void *  p,
u32  val,
uword  count 
)

Definition at line 332 of file string.h.

static_always_inline void clib_memset_u64 ( void *  p,
u64  val,
uword  count 
)

Definition at line 295 of file string.h.

static_always_inline void clib_memset_u8 ( void *  p,
u8  val,
uword  count 
)

Definition at line 424 of file string.h.

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void clib_memswap ( void *  _a,
void *  _b,
uword  bytes 
)

Definition at line 49 of file string.c.

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errno_t memcmp_s ( const void *  s1,
rsize_t  s1max,
const void *  s2,
rsize_t  s2max,
int *  diff 
)

compare memory until they differ, and their difference is returned in diff

ISO/IEC 9899:2017(C11), Porgramming languages – C Annex K; Bounds-checking interfaces

Parameters
*s1pointer to memory to compare against
s1maxmaximum length of s1
*s2pointer to memory to compare with s1
s2maxlength of s2
*diffpointer to the diff which is an integer greater than, equal to, or less than zero according to s1 is greater than, equal to, or less than s2.

No null pointers s1max and s2max shall not be zero s2max shall not be greater than s1max

Returns
EOK success diff when the return code is EOK >0 s1 greater s2 0 s1 == s2 <0 s1 < s2 EINVAL runtime constraint error

Definition at line 178 of file string.c.

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static errno_t memcmp_s_inline ( const void *  s1,
rsize_t  s1max,
const void *  s2,
rsize_t  s2max,
int *  diff 
)
inlinestatic

Definition at line 747 of file string.h.

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errno_t memcpy_s ( void *__restrict__  dest,
rsize_t  dmax,
const void *__restrict__  src,
rsize_t  n 
)

copy src to dest, at most n bytes, up to dmax

ISO/IEC 9899:2017(C11), Porgramming languages – C Annex K; Bounds-checking interfaces

Parameters
*destpointer to memory to copy to
dmaxmaximum length of resulting dest
*srcpointer to memory to copy from
nmaximum number of characters to copy from src

No null pointers n shall not be greater than dmax no memory overlap between src and dest

Returns
EOK success EINVAL runtime constraint error

Definition at line 120 of file string.c.

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static errno_t memcpy_s_inline ( void *__restrict__  dest,
rsize_t  dmax,
const void *__restrict__  src,
rsize_t  n 
)
inlinestatic

Definition at line 121 of file string.h.

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errno_t memset_s ( void *  s,
rsize_t  smax,
int  c,
rsize_t  n 
)

set n bytes starting at s to the specified c value

ISO/IEC 9899:2017(C11), Porgramming languages – C Annex K; Bounds-checking interfaces

Parameters
*spointer to memory to set the c value
smaxmaximum length of resulting s
cbyte value
nmaximum number of characters to set in s

No null pointers n shall not be greater than smax

Returns
EOK success EINVAL runtime constraint error

Definition at line 145 of file string.c.

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static errno_t memset_s_inline ( void *  s,
rsize_t  smax,
int  c,
rsize_t  n 
)
inlinestatic

Definition at line 185 of file string.h.

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errno_t strcat_s ( char *__restrict__  dest,
rsize_t  dmax,
const char *__restrict__  src 
)

append src string to dest string, including null

ISO/IEC 9899:2017(C11), Porgramming languages – C Annex K; Bounds-checking interfaces

Parameters
*destpointer to string to append to
dmaxmaximum length of resulting dest string, including null
*srcpointer to string to append from

No null pointers dmax shall not be zero dest shall be null terminated given m = dmax - strnlen (dest, dmax) n = strnlen (src, m) n shall not be >= m no memory overlap between src and dest

Returns
EOK success EINVAL runtime constraint error

Definition at line 328 of file string.c.

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static errno_t strcat_s_inline ( char *__restrict__  dest,
rsize_t  dmax,
const char *__restrict__  src 
)
inlinestatic

Definition at line 1080 of file string.h.

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errno_t strcmp_s ( const char *  s1,
rsize_t  s1max,
const char *  s2,
int *  indicator 
)

compare string s2 to string s1, and their difference is returned in indicator

ISO/IEC 9899:2017(C11), Porgramming languages – C Annex K; Bounds-checking interfaces

Parameters
*s1pointer to string to compare against
s1maxmaximum length of s1, excluding null
*s2pointer to string to compare with s1
*indicatorpointer to the comparison result, which is an integer greater than, equal to, or less than zero according to s1 is greater than, equal to, or less than s2.

No null pointers s1max shall not be zero s1 shall be null terminated n shall not be greater than the smaller of s1max and strlen of s1

Returns
EOK success indicator when the return code is EOK >0 s1 greater s2 0 s1 == s2 <0 s1 < s2 EINVAL runtime constraint error

Definition at line 213 of file string.c.

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static errno_t strcmp_s_inline ( const char *  s1,
rsize_t  s1max,
const char *  s2,
int *  indicator 
)
inlinestatic

Definition at line 836 of file string.h.

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errno_t strcpy_s ( char *__restrict__  dest,
rsize_t  dmax,
const char *__restrict__  src 
)

copy src string to dest string

ISO/IEC 9899:2017(C11), Porgramming languages – C Annex K; Bounds-checking interfaces

Parameters
*destpointer to string to copy to
dmaxmaximum length of resulting dest string, including null
*srcpointer to string to copy from

No null pointers dmax shall not be zero dmax shall be greater than string length of src no memory overlap between src and dest

Returns
EOK success EINVAL runtime constraint error

Definition at line 272 of file string.c.

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static errno_t strcpy_s_inline ( char *__restrict__  dest,
rsize_t  dmax,
const char *__restrict__  src 
)
inlinestatic

Definition at line 944 of file string.h.

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errno_t strncat_s ( char *__restrict__  dest,
rsize_t  dmax,
const char *__restrict__  src,
rsize_t  n 
)

append src string to dest string, including null, no more than n characters

ISO/IEC 9899:2017(C11), Porgramming languages – C Annex K; Bounds-checking interfaces

Parameters
*destpointer to string to append to
dmaxmaximum length of resulting dest string, including null
*srcpointer to string to append from
nmaximum characters to append (excluding null)

No null pointers dmax shall not be zero dest shall be null terminated dmax - strnlen (dest, dmax) shall not be zero no memory overlap between src and dest

Returns
EOK success EINVAL runtime constraint error EOVERFLOW truncated operation. dmax - 1 characters were appended. dest is null terminated.

Definition at line 358 of file string.c.

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static errno_t strncat_s_inline ( char *__restrict__  dest,
rsize_t  dmax,
const char *__restrict__  src,
rsize_t  n 
)
inlinestatic

Definition at line 1141 of file string.h.

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errno_t strncmp_s ( const char *  s1,
rsize_t  s1max,
const char *  s2,
rsize_t  n,
int *  indicator 
)

compare string s2 to string s1, no more than n characters, and their difference is returned in indicator

ISO/IEC 9899:2017(C11), Porgramming languages – C Annex K; Bounds-checking interfaces

Parameters
*s1pointer to string to compare against
s1maxmaximum length of s1, excluding null
*s2pointer to string to compare with s1
nmaximum number of characters to compare
*indicatorpointer to the comparison result, which is an integer greater than, equal to, or less than zero according to s1 is greater than, equal to, or less than s2.

No null pointers s1max shall not be zero s1 shall be null terminated

Returns
EOK success indicator when the return code is EOK >0 s1 greater s2 0 s1 == s2 <0 s1 < s2 EINVAL runtime constraint error

Definition at line 246 of file string.c.

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static errno_t strncmp_s_inline ( const char *  s1,
rsize_t  s1max,
const char *  s2,
rsize_t  n,
int *  indicator 
)
inlinestatic

Definition at line 890 of file string.h.

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errno_t strncpy_s ( char *__restrict__  dest,
rsize_t  dmax,
const char *__restrict__  src,
rsize_t  n 
)

copy src string to dest string, no more than n characters

ISO/IEC 9899:2017(C11), Porgramming languages – C Annex K; Bounds-checking interfaces

Parameters
*destpointer to string to copy to
dmaxmaximum length of resulting dest string, including null
*srcpointer to string to copy from
nmaximum number of characters to copy from src, excluding null

No null pointers dmax shall not be zero no memory overlap between src and dest

Returns
EOK success EINVAL runtime constraint error EOVERFLOW truncated operation. dmax - 1 characters were copied. dest is null terminated.

Definition at line 299 of file string.c.

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static errno_t strncpy_s_inline ( char *__restrict__  dest,
rsize_t  dmax,
const char *__restrict__  src,
rsize_t  n 
)
inlinestatic

Definition at line 1002 of file string.h.

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size_t strnlen_s ( const char *  s,
size_t  maxsize 
)

compute the length in s, no more than maxsize

ISO/IEC 9899:2017(C11), Porgramming languages – C Annex K; Bounds-checking interfaces

Parameters
*spointer to string
maxsizerestricted maximum length

No null pointers maxsize shall not be zero

Returns
size_t the string length in s, excluding null character, and no more than maxsize or 0 if there is a constraint error

Definition at line 433 of file string.c.

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static size_t strnlen_s_inline ( const char *  s,
size_t  maxsize 
)
inlinestatic

Definition at line 790 of file string.h.

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errno_t strstr_s ( char *  s1,
rsize_t  s1max,
const char *  s2,
rsize_t  s2max,
char **  substring 
)

locate the first occurrence of the substring s2 in s1

ISO/IEC 9899:2017(C11), Porgramming languages – C Annex K; Bounds-checking interfaces

Parameters
*s1pointer to string to be searched for substring
s1maxrestricted maximum length of s1
*s2pointer to substring to search
s2maxrestricted maximum length of s2
**substringpointer to pointer substring to be returned

No null pointers s1max and s2max shall not be zero s1 and s2 shall be null terminated

Returns
EOK success substring when the return code is EOK, it contains the pointer which points to s1 that matches s2 EINVAL runtime constraint error ESRCH no match

Example: char *sub = 0; char *s1 = "success is not final, failure is not fatal.";

strstr_s (s1, strlen (s1), "failure", strlen ("failure"), &sub);

After the above call, sub = "failure is not fatal."

Definition at line 470 of file string.c.

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static errno_t strstr_s_inline ( char *  s1,
rsize_t  s1max,
const char *  s2,
rsize_t  s2max,
char **  substring 
)
inlinestatic

Definition at line 1377 of file string.h.

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char* strtok_s ( char *__restrict__  s1,
rsize_t *__restrict__  s1max,
const char *__restrict__  s2,
char **__restrict__  ptr 
)

tokenize string s1 with delimiter specified in s2.

This is a stateful API when it is iterately called, it returns the next token from s1 which is delimited by s2. s1max and ptr maintain the stateful information for the same caller and must not be altered by the caller during the iteration for the correct result

ISO/IEC 9899:2017(C11), Porgramming languages – C Annex K; Bounds-checking interfaces

Parameters
*s1pointer to string to be searched for substring
*s1maxrestricted maximum length of s1
*s2pointer to substring to search (16 characters max, including null)
**ptrin/out pointer which maintains the stateful information

s2, s1max, and ptr shall not be null if s1 is null, contents of ptr shall not be null s1 and s2 shall be null terminated

Returns
non-null pointer to the first character of a token s1max and ptr are modified to contain the state null runtime constraint error or token is not found

Example: char *str2 = " "; char str1[100]; uword len; char *p2str = 0; char *tok1, *tok2, *tok3, *tok4, *tok5, *tok6, *tok7;

strncpy (str1, "brevity is the soul of wit", sizeof (str1)); len = strlen (str1); tok1 = strtok_s (str1, &len, str2, &p2str); tok2 = strtok_s (0, &len, str2, &p2str); tok3 = strtok_s (0, &len, str2, &p2str); tok4 = strtok_s (0, &len, str2, &p2str); tok5 = strtok_s (0, &len, str2, &p2str); tok6 = strtok_s (0, &len, str2, &p2str); tok7 = strtok_s (0, &len, str2, &p2str);

After the above series of calls, tok1 = "brevity", tok2 = "is", tok3 = "the", tok4 = "soul", tok5 = "of", tok6 = "wit", tok7 = null

Definition at line 410 of file string.c.

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static char* strtok_s_inline ( char *__restrict__  s1,
rsize_t *__restrict__  s1max,
const char *__restrict__  s2,
char **__restrict__  ptr 
)
inlinestatic

Definition at line 1223 of file string.h.

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