lib_str.c
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上传日期:2017-01-28
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- /*
- *********************************************************************************************************
- * uC/LIB
- * CUSTOM LIBRARY MODULES
- *
- * (c) Copyright 2004-2008; Micrium, Inc.; Weston, FL
- *
- * All rights reserved. Protected by international copyright laws.
- *
- * uC/LIB is provided in source form for FREE evaluation, for educational
- * use or peaceful research. If you plan on using uC/LIB in a commercial
- * product you need to contact Micrium to properly license its use in your
- * product. We provide ALL the source code for your convenience and to
- * help you experience uC/LIB. The fact that the source code is provided
- * does NOT mean that you can use it without paying a licensing fee.
- *
- * Knowledge of the source code may NOT be used to develop a similar product.
- *
- * Please help us continue to provide the Embedded community with the finest
- * software available. Your honesty is greatly appreciated.
- *********************************************************************************************************
- */
- /*
- *********************************************************************************************************
- *
- * ASCII STRING MANAGEMENT
- *
- * Filename : lib_str.c
- * Version : V1.25
- * Programmer(s) : ITJ
- * JDH
- *********************************************************************************************************
- * Note(s) : (1) NO compiler-supplied standard library functions are used in library or product software.
- *
- * (a) ALL standard library functions are implemented in the custom library modules :
- *
- * (1) <Custom Library Directory>lib*.*
- *
- * (2) <Custom Library Directory>Ports<cpu><compiler>lib*_a.*
- *
- * where
- * <Custom Library Directory> directory path for custom library software
- * <cpu> directory name for specific processor (CPU)
- * <compiler> directory name for specific compiler
- *
- * (b) Product-specific library functions are implemented in individual products.
- *********************************************************************************************************
- */
- /*
- *********************************************************************************************************
- * INCLUDE FILES
- *********************************************************************************************************
- */
- #define LIB_STR_MODULE
- #include <lib_str.h>
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * LOCAL DEFINES
- *********************************************************************************************************
- */
- /*
- *********************************************************************************************************
- * LOCAL CONSTANTS
- *********************************************************************************************************
- */
- /*
- *********************************************************************************************************
- * LOCAL DATA TYPES
- *********************************************************************************************************
- */
- /*
- *********************************************************************************************************
- * LOCAL TABLES
- *********************************************************************************************************
- */
- /*
- *********************************************************************************************************
- * LOCAL GLOBAL VARIABLES
- *********************************************************************************************************
- */
- /*
- *********************************************************************************************************
- * LOCAL FUNCTION PROTOTYPES
- *********************************************************************************************************
- */
- /*
- *********************************************************************************************************
- * LOCAL CONFIGURATION ERRORS
- *********************************************************************************************************
- */
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * Str_Len()
- *
- * Description : Calculate length of a string.
- *
- * Argument(s) : pstr Pointer to string (see Note #1).
- *
- * Return(s) : Length of string; number of characters in string before terminating NULL character.
- *
- * Caller(s) : Application.
- *
- * Note(s) : (1) String buffer NOT modified.
- *
- * (2) String length calculation terminates when :
- *
- * (a) String pointer points to NULL.
- * (1) String buffer overlaps with NULL address.
- * (2) String length calculated for string up to but NOT beyond or including
- * the NULL address.
- *
- * (b) Terminating NULL character found.
- * (1) String length calculated for string up to but NOT including
- * the NULL character.
- *********************************************************************************************************
- */
- CPU_SIZE_T Str_Len (CPU_CHAR *pstr)
- {
- CPU_SIZE_T len;
- len = 0;
- while (( pstr != (CPU_CHAR *)0) && /* Calc str len until NULL ptr (see Note #2a) ... */
- (*pstr != (CPU_CHAR )0)) { /* ... or NULL char found (see Note #2b). */
- len++;
- pstr++;
- }
- return (len);
- }
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * Str_Copy()
- *
- * Description : Copy source string to destination string buffer.
- *
- * Argument(s) : pdest Pointer to destination string buffer to receive source string copy (see Note #1).
- *
- * psrc Pointer to source string to copy into destination string buffer.
- *
- * Return(s) : Pointer to destination string, if NO errors (see Note #2).
- *
- * Pointer to NULL, otherwise.
- *
- * Caller(s) : Application.
- *
- * Note(s) : (1) Destination buffer size NOT validated; buffer overruns MUST be prevented by caller.
- *
- * (a) Destination buffer size MUST be large enough to accommodate the entire source
- * string size including the terminating NULL character.
- *
- * (2) String copy terminates when :
- *
- * (a) Destination/Source string pointer(s) are passed NULL pointers.
- * (1) No string copy performed; NULL pointer returned.
- *
- * (b) Destination/Source string pointer(s) points to NULL.
- * (1) String buffer(s) overlap with NULL address.
- * (2) Source string copied into destination string buffer up to but NOT beyond or
- * including the NULL address; destination string buffer properly terminated
- * with NULL character.
- *
- * (c) Source string's terminating NULL character found.
- * (1) Entire source string copied into destination string buffer.
- *********************************************************************************************************
- */
- CPU_CHAR *Str_Copy (CPU_CHAR *pdest,
- CPU_CHAR *psrc)
- {
- CPU_CHAR *pstr;
- CPU_CHAR *pstr_next;
- /* Rtn NULL if str ptr(s) NULL (see Note #2a). */
- if (pdest == (CPU_CHAR *)0) {
- return ((CPU_CHAR *)0);
- }
- if (psrc == (CPU_CHAR *)0) {
- return ((CPU_CHAR *)0);
- }
- pstr = pdest;
- pstr_next = pstr;
- pstr_next++;
- while (( pstr_next != (CPU_CHAR *)0) && /* Copy str until NULL ptr(s) (see Note #2b) ... */
- ( psrc != (CPU_CHAR *)0) &&
- (*psrc != (CPU_CHAR )0)) { /* ... or NULL char found (see Note #2c). */
- *pstr = *psrc;
- pstr++;
- pstr_next++;
- psrc++;
- }
- *pstr = (CPU_CHAR)0; /* Append NULL char (see Note #2b2). */
- return (pdest);
- }
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * Str_Copy_N()
- *
- * Description : Copy source string to destination string buffer, up to a maximum number of characters.
- *
- * Argument(s) : pdest Pointer to destination string buffer to receive source string copy (see Note #1).
- *
- * psrc Pointer to source string to copy into destination string buffer.
- *
- * len_max Maximum number of characters to copy (see Note #2d).
- *
- * Return(s) : Pointer to destination string, if NO errors (see Note #2).
- *
- * Pointer to NULL, otherwise.
- *
- * Caller(s) : Application.
- *
- * Note(s) : (1) Destination buffer size NOT validated; buffer overruns MUST be prevented by caller.
- *
- * (a) Destination buffer size MUST be large enough to accommodate the entire source
- * string size including the terminating NULL character.
- *
- * (2) String copy terminates when :
- *
- * (a) Destination/Source string pointer(s) are passed NULL pointers.
- * (1) No string copy performed; NULL pointer returned.
- *
- * (b) Destination/Source string pointer(s) points to NULL.
- * (1) String buffer(s) overlap with NULL address.
- * (2) Source string copied into destination string buffer up to but NOT beyond or
- * including the NULL address; destination string buffer properly terminated
- * with NULL character.
- *
- * (c) Source string's terminating NULL character found.
- * (1) Entire source string copied into destination string buffer.
- *
- * (d) 'len_max' number of characters copied.
- * (1) 'len_max' number of characters does NOT include the terminating NULL character.
- *
- * See also Note #1a.
- *********************************************************************************************************
- */
- CPU_CHAR *Str_Copy_N (CPU_CHAR *pdest,
- CPU_CHAR *psrc,
- CPU_SIZE_T len_max)
- {
- CPU_CHAR *pstr;
- CPU_CHAR *pstr_next;
- CPU_SIZE_T len_copy;
- /* Rtn NULL if str ptr(s) NULL (see Note #2a). */
- if (pdest == (CPU_CHAR *)0) {
- return ((CPU_CHAR *)0);
- }
- if (psrc == (CPU_CHAR *)0) {
- return ((CPU_CHAR *)0);
- }
- if (len_max == (CPU_SIZE_T)0) { /* Rtn NULL if copy len equals zero (see Note #2d). */
- return ((CPU_CHAR *)0);
- }
- pstr = pdest;
- pstr_next = pstr;
- pstr_next++;
- len_copy = 0;
- while (( pstr_next != (CPU_CHAR *)0) && /* Copy str until NULL ptr(s) (see Note #2b) ... */
- ( psrc != (CPU_CHAR *)0) &&
- (*psrc != (CPU_CHAR )0) && /* ... or NULL char found (see Note #2c); ... */
- ( len_copy < (CPU_SIZE_T)len_max)) { /* ... or max nbr chars copied (see Note #2d). */
- *pstr = *psrc;
- pstr++;
- pstr_next++;
- psrc++;
- len_copy++;
- }
- *pstr = (CPU_CHAR)0; /* Append NULL char (see Note #2b2). */
- return (pdest);
- }
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * Str_Cat()
- *
- * Description : Append concatenation string to destination string.
- *
- * Argument(s) : pdest Pointer to destination string to append concatenation string (see Note #1).
- *
- * pstr_cat Pointer to concatenation string to append to destination string.
- *
- * Return(s) : Pointer to destination string, if NO errors (see Note #2).
- *
- * Pointer to NULL, otherwise.
- *
- * Caller(s) : Application.
- *
- * Note(s) : (1) Destination string buffer size NOT validated; buffer overruns MUST be prevented by caller.
- *
- * (a) Destination buffer size MUST be large enough to accommodate the entire concatenated
- * string size including the terminating NULL character.
- *
- * (2) String concatenation terminates when :
- *
- * (a) Destination/Concatenation string pointer(s) are passed NULL pointers.
- * (1) No string concatenation performed; NULL pointer returned.
- *
- * (b) Destination string overlaps with NULL address.
- * (1) No string concatenation performed; NULL pointer returned.
- *
- * (c) Destination/Concatenation string pointer(s) points to NULL.
- * (1) String buffer(s) overlap with NULL address.
- * (2) Concatenation string appended into destination string buffer up to but NOT
- * beyond or including the NULL address; destination string buffer properly
- * terminated with NULL character.
- *
- * (d) Concatenation string's terminating NULL character found.
- * (1) Entire concatenation string appended to destination string.
- *********************************************************************************************************
- */
- CPU_CHAR *Str_Cat (CPU_CHAR *pdest,
- CPU_CHAR *pstr_cat)
- {
- CPU_CHAR *pstr;
- CPU_CHAR *pstr_next;
- /* Rtn NULL if str ptr(s) NULL (see Note #2a). */
- if (pdest == (CPU_CHAR *)0) {
- return ((CPU_CHAR *)0);
- }
- if (pstr_cat == (CPU_CHAR *)0) {
- return ((CPU_CHAR *)0);
- }
- pstr = pdest;
- while (( pstr != (CPU_CHAR *)0) && /* Adv to end of cur dest str until NULL ptr ... */
- (*pstr != (CPU_CHAR )0)) { /* ... or NULL char found.. */
- pstr++;
- }
- if (pstr == (CPU_CHAR *)0) { /* If NULL str overrun, rtn NULL (see Note #2b). */
- return ((CPU_CHAR *)0);
- }
- pstr_next = pstr;
- pstr_next++;
- while (( pstr_next != (CPU_CHAR *)0) && /* Cat str until NULL ptr(s) (see Note #2c) ... */
- ( pstr_cat != (CPU_CHAR *)0) &&
- (*pstr_cat != (CPU_CHAR )0)) { /* ... or NULL char found (see Note #2d). */
- *pstr = *pstr_cat;
- pstr++;
- pstr_next++;
- pstr_cat++;
- }
- *pstr = (CPU_CHAR)0; /* Append NULL char (see Note #2c2). */
- return (pdest);
- }
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * Str_Cat_N()
- *
- * Description : Append concatenation string to destination string, up to a maximum number of characters.
- *
- * Argument(s) : pdest Pointer to destination string to append concatenation string (see Note #1).
- *
- * pstr_cat Pointer to concatenation string to append to destination string.
- *
- * len_max Maximum number of characters to concatenate (see Note #2e).
- *
- * Return(s) : Pointer to destination string, if NO errors (see Note #2).
- *
- * Pointer to NULL, otherwise.
- *
- * Caller(s) : Application.
- *
- * Note(s) : (1) Destination string buffer size NOT validated; buffer overruns MUST be prevented by caller.
- *
- * (a) Destination buffer size MUST be large enough to accommodate the entire concatenated
- * string size including the terminating NULL character.
- *
- * (2) String concatenation terminates when :
- *
- * (a) Destination/Concatenation string pointer(s) are passed NULL pointers.
- * (1) No string concatenation performed; NULL pointer returned.
- *
- * (b) Destination string overlaps with NULL address.
- * (1) No string concatenation performed; NULL pointer returned.
- *
- * (c) Destination/Concatenation string pointer(s) points to NULL.
- * (1) String buffer(s) overlap with NULL address.
- * (2) Concatenation string appended into destination string buffer up to but NOT
- * beyond or including the NULL address; destination string buffer properly
- * terminated with NULL character.
- *
- * (d) Concatenation string's terminating NULL character found.
- * (1) Entire concatenation string appended to destination string.
- *
- * (e) 'len_max' number of characters concatenated.
- * (1) 'len_max' number of characters does NOT include the terminating NULL character.
- *
- * See also Note #1a.
- *********************************************************************************************************
- */
- /*$PAGE*/
- CPU_CHAR *Str_Cat_N (CPU_CHAR *pdest,
- CPU_CHAR *pstr_cat,
- CPU_SIZE_T len_max)
- {
- CPU_CHAR *pstr;
- CPU_CHAR *pstr_next;
- CPU_SIZE_T len_cat;
- /* Rtn NULL if str ptr(s) NULL (see Note #2a). */
- if (pdest == (CPU_CHAR *)0) {
- return ((CPU_CHAR *)0);
- }
- if (pstr_cat == (CPU_CHAR *)0) {
- return ((CPU_CHAR *)0);
- }
- if (len_max == (CPU_SIZE_T)0) { /* Rtn NULL if cat len equals zero (see Note #2e). */
- return ((CPU_CHAR *)0);
- }
- pstr = pdest;
- while (( pstr != (CPU_CHAR *)0) && /* Adv to end of cur dest str until NULL ptr ... */
- (*pstr != (CPU_CHAR )0)) { /* ... or NULL char found.. */
- pstr++;
- }
- if (pstr == (CPU_CHAR *)0) { /* If NULL str overrun, rtn NULL (see Note #2b). */
- return ((CPU_CHAR *)0);
- }
- pstr_next = pstr;
- pstr_next++;
- len_cat = 0;
- while (( pstr_next != (CPU_CHAR *)0) && /* Cat str until NULL ptr(s) (see Note #2c) ... */
- ( pstr_cat != (CPU_CHAR *)0) &&
- (*pstr_cat != (CPU_CHAR )0) && /* ... or NULL char found (see Note #2d); ... */
- ( len_cat < (CPU_SIZE_T)len_max)) { /* ... or max nbr chars cat'd (see Note #2d). */
- *pstr = *pstr_cat;
- pstr++;
- pstr_next++;
- pstr_cat++;
- len_cat++;
- }
- *pstr = (CPU_CHAR)0; /* Append NULL char (see Note #2c2). */
- return (pdest);
- }
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * Str_Cmp()
- *
- * Description : Determine if two strings are identical.
- *
- * Argument(s) : p1_str Pointer to first string (see Note #1).
- *
- * p2_str Pointer to second string (see Note #1).
- *
- * Return(s) : 0, if strings are identical (see Notes #2a, #2e, & #2f).
- *
- * Negative value, if 'p1_str' is less than 'p2_str' (see Notes #2b, #2g, & #2d).
- *
- * Positive value, if 'p1_str' is greater than 'p2_str' (see Notes #2c, #2h, & #2d).
- *
- * Caller(s) : Application.
- *
- * Note(s) : (1) String buffers NOT modified.
- *
- * (2) String comparison terminates when :
- *
- * (a) BOTH string pointer(s) are passed NULL pointers.
- * (1) NULL strings identical; return 0.
- *
- * (b) 'p1_str' passed a NULL pointer.
- * (1) Return negative value of character pointed to by 'p2_str'.
- *
- * (c) 'p2_str' passed a NULL pointer.
- * (1) Return positive value of character pointed to by 'p1_str'.
- *
- * (d) Non-matching characters found.
- * (1) Return signed-integer difference of the character pointed to by 'p2_str'
- * from the character pointed to by 'p1_str'.
- *
- * (e) Terminating NULL character found in both strings.
- * (1) Strings identical; return 0.
- * (2) Only one NULL character test required in conditional since previous condition
- * tested character equality.
- *
- * (f) BOTH strings point to NULL.
- * (1) Strings overlap with NULL address.
- * (2) Strings identical up to but NOT beyond or including the NULL address; return 0.
- *
- * (g) 'p1_str_next' points to NULL.
- * (1) 'p1_str' overlaps with NULL address.
- * (2) Strings compared up to but NOT beyond or including the NULL address.
- * (3) Return negative value of character pointed to by 'p2_str_next'.
- *
- * (h) 'p2_str_next' points to NULL.
- * (1) 'p2_str' overlaps with NULL address.
- * (2) Strings compared up to but NOT beyond or including the NULL address.
- * (3) Return positive value of character pointed to by 'p1_str_next'.
- *
- * (3) Since 16-bit signed arithmetic is performed to calculate a non-identical comparison
- * return value, 'CPU_CHAR' native data type size MUST be 8-bit.
- *********************************************************************************************************
- */
- /*$PAGE*/
- CPU_INT16S Str_Cmp (CPU_CHAR *p1_str,
- CPU_CHAR *p2_str)
- {
- CPU_CHAR *p1_str_next;
- CPU_CHAR *p2_str_next;
- CPU_INT16S cmp_val;
- if (p1_str == (CPU_CHAR *)0) {
- if (p2_str == (CPU_CHAR *)0) {
- return ((CPU_INT16S)0); /* If BOTH str ptrs NULL, rtn 0 (see Note #2a). */
- }
- cmp_val = (CPU_INT16S)0 - (CPU_INT16S)(*p2_str);
- return (cmp_val); /* If p1_str NULL, rtn neg p2_str val (see Note #2b). */
- }
- if (p2_str == (CPU_CHAR *)0) {
- cmp_val = (CPU_INT16S)(*p1_str);
- return (cmp_val); /* If p2_str NULL, rtn pos p1_str val (see Note #2c). */
- }
- p1_str_next = p1_str;
- p2_str_next = p2_str;
- p1_str_next++;
- p2_str_next++;
- while ((*p1_str == *p2_str) && /* Cmp strs until non-matching char (see Note #2d) .. */
- (*p1_str != (CPU_CHAR )0) && /* .. or NULL char(s) (see Note #2e) .. */
- ( p1_str_next != (CPU_CHAR *)0) && /* .. or NULL ptr(s) found (see Notes #2f, #2g, & #2h). */
- ( p2_str_next != (CPU_CHAR *)0)) {
- p1_str_next++;
- p2_str_next++;
- p1_str++;
- p2_str++;
- }
- if (*p1_str != *p2_str) { /* If strs NOT identical, ... */
- cmp_val = (CPU_INT16S)(*p1_str) - (CPU_INT16S)(*p2_str); /* ... calc & rtn char diff (see Note #2d1). */
- } else if (*p1_str == (CPU_CHAR)0) { /* If NULL char(s) found, ... */
- cmp_val = 0; /* ... strs identical; rtn 0 (see Note #2e). */
- } else {
- if (p1_str_next == (CPU_CHAR *)0) {
- if (p2_str_next == (CPU_CHAR *)0) { /* If BOTH next str ptrs NULL, ... */
- cmp_val = (CPU_INT16S)0; /* ... rtn 0 (see Note #2f). */
- } else { /* If p1_str_next NULL, ... */
- cmp_val = (CPU_INT16S)0 - (CPU_INT16S)(*p2_str_next); /* ... rtn neg p2_str_next val (see Note #2g). */
- }
- } else { /* If p2_str_next NULL, ... */
- cmp_val = (CPU_INT16S)(*p1_str_next); /* ... rtn pos p1_str_next val (see Note #2h). */
- }
- }
- return (cmp_val);
- }
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * Str_Cmp_N()
- *
- * Description : Determine if two strings are identical for up to a maximum number of characters.
- *
- * Argument(s) : p1_str Pointer to first string (see Note #1).
- *
- * p2_str Pointer to second string (see Note #1).
- *
- * len_max Maximum number of characters to compare (see Notes #2i & #2j).
- *
- * Return(s) : 0, if strings are identical (see Notes #2a, #2e, #2f, #2i, & #2j).
- *
- * Negative value, if 'p1_str' is less than 'p2_str' (see Notes #2b, #2g, & #2d).
- *
- * Positive value, if 'p1_str' is greater than 'p2_str' (see Notes #2c, #2h, & #2d).
- *
- * Caller(s) : Application.
- *
- * Note(s) : (1) String buffers NOT modified.
- *
- * (2) String comparison terminates when :
- *
- * (a) BOTH string pointer(s) are passed NULL pointers.
- * (1) NULL strings identical; return 0.
- *
- * (b) 'p1_str' passed a NULL pointer.
- * (1) Return negative value of character pointed to by 'p2_str'.
- *
- * (c) 'p2_str' passed a NULL pointer.
- * (1) Return positive value of character pointed to by 'p1_str'.
- *
- * (d) Non-matching characters found.
- * (1) Return signed-integer difference of the character pointed to by 'p2_str'
- * from the character pointed to by 'p1_str'.
- *
- * (e) Terminating NULL character found in both strings.
- * (1) Strings identical; return 0.
- * (2) Only one NULL character test required in conditional since previous condition
- * tested character equality.
- *
- * (f) BOTH strings point to NULL.
- * (1) Strings overlap with NULL address.
- * (2) Strings identical up to but NOT beyond or including the NULL address; return 0.
- *
- * (g) 'p1_str_next' points to NULL.
- * (1) 'p1_str' overlaps with NULL address.
- * (2) Strings compared up to but NOT beyond or including the NULL address.
- * (3) Return negative value of character pointed to by 'p2_str_next'.
- *
- * (h) 'p2_str_next' points to NULL.
- * (1) 'p2_str' overlaps with NULL address.
- * (2) Strings compared up to but NOT beyond or including the NULL address.
- * (3) Return positive value of character pointed to by 'p1_str_next'.
- *
- * (i) 'len_max' passed a zero length.
- * (1) Zero-length strings identical; return 0.
- *
- * (j) First 'len_max' number of characters identical.
- * (1) Strings identical; return 0.
- *
- * (3) Since 16-bit signed arithmetic is performed to calculate a non-identical comparison
- * return value, 'CPU_CHAR' native data type size MUST be 8-bit.
- *********************************************************************************************************
- */
- /*$PAGE*/
- CPU_INT16S Str_Cmp_N (CPU_CHAR *p1_str,
- CPU_CHAR *p2_str,
- CPU_SIZE_T len_max)
- {
- CPU_CHAR *p1_str_next;
- CPU_CHAR *p2_str_next;
- CPU_INT16S cmp_val;
- CPU_SIZE_T cmp_len;
- if (len_max == 0) { /* If cmp len equals zero, rtn 0 (see Note #2i). */
- return ((CPU_INT16S)0);
- }
- if (p1_str == (CPU_CHAR *)0) {
- if (p2_str == (CPU_CHAR *)0) {
- return ((CPU_INT16S)0); /* If BOTH str ptrs NULL, rtn 0 (see Note #2a). */
- }
- cmp_val = (CPU_INT16S)0 - (CPU_INT16S)(*p2_str);
- return (cmp_val); /* If p1_str NULL, rtn neg p2_str val (see Note #2b). */
- }
- if (p2_str == (CPU_CHAR *)0) {
- cmp_val = (CPU_INT16S)(*p1_str);
- return (cmp_val); /* If p2_str NULL, rtn pos p1_str val (see Note #2c). */
- }
- p1_str_next = p1_str;
- p2_str_next = p2_str;
- p1_str_next++;
- p2_str_next++;
- cmp_len = 0;
- while ((*p1_str == *p2_str) && /* Cmp strs until non-matching char (see Note #2d) .. */
- (*p1_str != (CPU_CHAR )0) && /* .. or NULL char(s) (see Note #2e) .. */
- ( p1_str_next != (CPU_CHAR *)0) && /* .. or NULL ptr(s) found (see Notes #2f, #2g, & #2h); */
- ( p2_str_next != (CPU_CHAR *)0) &&
- ( cmp_len < (CPU_SIZE_T)len_max)) { /* .. or len nbr chars cmp'd (see Note #2j). */
- p1_str_next++;
- p2_str_next++;
- p1_str++;
- p2_str++;
- cmp_len++;
- }
- if (cmp_len == len_max) { /* If strs identical for len nbr of chars, */
- return ((CPU_INT16S)0); /* ... rtn 0 (see Note #2j). */
- }
- if (*p1_str != *p2_str) { /* If strs NOT identical, ... */
- cmp_val = (CPU_INT16S)(*p1_str) - (CPU_INT16S)(*p2_str); /* ... calc & rtn char diff (see Note #2d1). */
- } else if (*p1_str == (CPU_CHAR)0) { /* If NULL char(s) found, ... */
- cmp_val = 0; /* ... strs identical; rtn 0 (see Note #2e). */
- } else {
- if (p1_str_next == (CPU_CHAR *)0) {
- if (p2_str_next == (CPU_CHAR *)0) { /* If BOTH next str ptrs NULL, ... */
- cmp_val = (CPU_INT16S)0; /* ... rtn 0 (see Note #2f). */
- } else { /* If p1_str_next NULL, ... */
- cmp_val = (CPU_INT16S)0 - (CPU_INT16S)(*p2_str_next); /* ... rtn neg p2_str_next val (see Note #2g). */
- }
- } else { /* If p2_str_next NULL, ... */
- cmp_val = (CPU_INT16S)(*p1_str_next); /* ... rtn pos p1_str_next val (see Note #2h). */
- }
- }
- return (cmp_val);
- }
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * Str_Char()
- *
- * Description : Search string for first occurrence of specific character.
- *
- * Argument(s) : pstr Pointer to string (see Note #1).
- *
- * srch_char Search character.
- *
- * Return(s) : Pointer to first occurrence of search character in string, if any.
- *
- * Pointer to NULL, otherwise.
- *
- * Caller(s) : Application.
- *
- * Note(s) : (1) String buffer NOT modified.
- *
- * (2) String search terminates when :
- *
- * (a) String pointer passed a NULL pointer.
- * (1) No string search performed; NULL pointer returned.
- *
- * (b) String pointer points to NULL.
- * (1) String overlaps with NULL address.
- * (2) String searched up to but NOT beyond or including the NULL address.
- *
- * (c) String's terminating NULL character found.
- * (1) Search character NOT found in search string; NULL pointer returned.
- * (2) Applicable ONLY IF search character is NOT the terminating NULL character.
- *
- * (d) Search character found.
- * (1) Return pointer to first occurrence of search character in search string.
- *********************************************************************************************************
- */
- CPU_CHAR *Str_Char (CPU_CHAR *pstr,
- CPU_CHAR srch_char)
- {
- CPU_CHAR *pstr_next;
- if (pstr == (CPU_CHAR *)0) { /* Rtn NULL if srch str ptr NULL (see Note #2a). */
- return ((CPU_CHAR *)0);
- }
- pstr_next = pstr;
- pstr_next++;
- while (( pstr_next != (CPU_CHAR *)0) && /* Srch str until NULL ptr(s) (see Note #2b) ... */
- (*pstr != (CPU_CHAR )0) && /* ... or NULL char (see Note #2c) ... */
- (*pstr != (CPU_CHAR )srch_char)) { /* ... or srch char found (see Note #2d). */
- pstr++;
- pstr_next++;
- }
- if (*pstr != srch_char) { /* If srch char NOT found, str points to NULL; ... */
- return ((CPU_CHAR *)0); /* ... rtn NULL (see Notes #2b & #2c). */
- }
- return (pstr); /* Else rtn ptr to found srch char (see Note #2d). */
- }
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * Str_Char_N()
- *
- * Description : Search string for first occurrence of specific character, up to a maximum number of characters.
- *
- * Argument(s) : pstr Pointer to string (see Note #1).
- *
- * len_max Maximum number of characters to search (see Notes #2e & #3).
- *
- * srch_char Search character.
- *
- * Return(s) : Pointer to first occurrence of search character in string, if any.
- *
- * Pointer to NULL, otherwise.
- *
- * Caller(s) : Application.
- *
- * Note(s) : (1) String buffer NOT modified.
- *
- * (2) String search terminates when :
- *
- * (a) String pointer passed a NULL pointer.
- * (1) No string search performed; NULL pointer returned.
- *
- * (b) String pointer points to NULL.
- * (1) String overlaps with NULL address.
- * (2) String searched up to but NOT beyond or including the NULL address.
- *
- * (c) String's terminating NULL character found.
- * (1) Search character NOT found in search string; NULL pointer returned.
- * (2) Applicable ONLY IF search character is NOT the terminating NULL character.
- *
- * (d) Search character found.
- * (1) Return pointer to first occurrence of search character in search string.
- *
- * (e) 'len_max' number of characters searched.
- * (1) 'len_max' number of characters does NOT include terminating NULL character.
- *
- * (3) Ideally, the 'len_max' parameter would be the last parameter in this function's
- * paramter list for consistency with all other custom string library functions.
- * However, the 'len_max' parameter is ordered to comply with the standard library
- * function's parameter list.
- *********************************************************************************************************
- */
- CPU_CHAR *Str_Char_N (CPU_CHAR *pstr,
- CPU_SIZE_T len_max,
- CPU_CHAR srch_char)
- {
- CPU_CHAR *pstr_next;
- CPU_SIZE_T len_srch;
- if (pstr == (CPU_CHAR *)0) { /* Rtn NULL if srch str ptr NULL (see Note #2a). */
- return ((CPU_CHAR *)0);
- }
- if (len_max == (CPU_SIZE_T)0) { /* Rtn NULL if srch len equals zero (see Note #2e). */
- return ((CPU_CHAR *)0);
- }
- pstr_next = pstr;
- pstr_next++;
- len_srch = 0;
- while (( pstr_next != (CPU_CHAR *)0) && /* Srch str until NULL ptr(s) (see Note #2b) ... */
- (*pstr != (CPU_CHAR )0) && /* ... or NULL char (see Note #2c) ... */
- (*pstr != (CPU_CHAR )srch_char) && /* ... or srch char found (see Note #2d); ... */
- ( len_srch < (CPU_SIZE_T)len_max)) { /* ... or max nbr chars srch'd (see Note #2e). */
- pstr++;
- pstr_next++;
- len_srch++;
- }
- if (*pstr != srch_char) { /* If srch char NOT found, str points to NULL; ... */
- return ((CPU_CHAR *)0); /* ... rtn NULL (see Notes #2b & #2c). */
- }
- return (pstr); /* Else rtn ptr to found srch char (see Note #2d). */
- }
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * Str_Char_Last()
- *
- * Description : Search string for last occurrence of specific character.
- *
- * Argument(s) : pstr Pointer to string (see Note #1).
- *
- * srch_char Search character.
- *
- * Return(s) : Pointer to last occurrence of search character in string, if any.
- *
- * Pointer to NULL, otherwise.
- *
- * Caller(s) : Application.
- *
- * Note(s) : (1) String buffer NOT modified.
- *
- * (2) String search terminates when :
- *
- * (a) String pointer passed a NULL pointer.
- * (1) No string search performed; NULL pointer returned.
- *
- * (b) String pointer points to NULL.
- * (1) String overlaps with NULL address.
- * (2) String searched up to but NOT beyond or including the NULL address.
- * (3) NULL address boundary handled in Str_Len().
- *
- * (c) String searched from end to beginning.
- * (1) Search character NOT found in search string; NULL pointer returned.
- * (2) Applicable ONLY IF search character is NOT the terminating NULL character.
- *
- * (d) Search character found.
- * (1) Return pointer to first occurrence of search character in search string.
- *********************************************************************************************************
- */
- CPU_CHAR *Str_Char_Last (CPU_CHAR *pstr,
- CPU_CHAR srch_char)
- {
- CPU_CHAR *pstr_next;
- CPU_SIZE_T str_len;
- if (pstr == (CPU_CHAR *)0) { /* Rtn NULL if srch str ptr NULL (see Note #2a). */
- return ((CPU_CHAR *)0);
- }
- pstr_next = pstr;
- str_len = Str_Len(pstr);
- pstr_next += str_len;
- while (( pstr_next != pstr) && /* Srch str from end until beg (see Note #2c) ... */
- (*pstr_next != srch_char)) { /* ... until srch char found (see Note #2d). */
- pstr_next--;
- }
- if (*pstr_next != srch_char) { /* If srch char NOT found, str points to NULL; ... */
- return ((CPU_CHAR *)0); /* ... rtn NULL (see Notes #2b & #2c). */
- }
- return (pstr_next); /* Else rtn ptr to found srch char (see Note #2d). */
- }
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * Str_Str()
- *
- * Description : Search string for first occurence of a specific search string.
- *
- * Argument(s) : pstr Pointer to string (see Note #1).
- *
- * psrch_str Pointer to search string (see Note #1).
- *
- * Return(s) : Pointer to first occurrence of search string in string, if any.
- *
- * Pointer to NULL, otherwise.
- *
- * Caller(s) : Application.
- *
- * Note(s) : (1) String buffers NOT modified.
- *
- * (2) String search terminates when :
- *
- * (a) String pointer passed a NULL pointer.
- * (1) No string search performed; NULL pointer returned.
- *
- * (b) Search string length greater than string length.
- * (1) No string search performed; NULL pointer returned.
- *
- * (c) Search string length equal to zero.
- * (1) NULL search string at end of string returned.
- *
- * (d) Entire string has been searched.
- * (1) Maximum size of the search is defined as the subtraction of the
- * search string length from the string length.
- * (2) Search string not found; NULL pointer returned.
- *
- * (e) Search string found.
- * (1) Search string found according to Str_Cmp_N() return value.
- * (2) Return pointer to first occurrence of search string in string.
- *********************************************************************************************************
- */
- CPU_CHAR *Str_Str (CPU_CHAR *pstr,
- CPU_CHAR *psrch_str)
- {
- CPU_SIZE_T str_len;
- CPU_SIZE_T srch_str_len;
- CPU_SIZE_T srch_len;
- CPU_SIZE_T srch_ix;
- CPU_BOOLEAN srch_done;
- CPU_INT16S srch_cmp = 0;
- CPU_CHAR *pstr_srch_ix = (void *)0;
- /* Rtn NULL if str ptr(s) NULL (see Note #2a). */
- if (pstr == (CPU_CHAR *)0) {
- return ((CPU_CHAR *)0);
- }
- if (psrch_str == (CPU_CHAR *)0) {
- return ((CPU_CHAR *)0);
- }
- str_len = Str_Len(pstr);
- srch_str_len = Str_Len(psrch_str);
- if (srch_str_len > str_len) { /* If srch str len > str len, rtn NULL (see Note #2b). */
- return ((CPU_CHAR *)0);
- }
- if (srch_str_len == 0) { /* If srch str len = 0, srch str equal NULL str; ... */
- pstr_srch_ix = (CPU_CHAR *)(pstr + str_len); /* ... rtn ptr to NULL str found in str (see Note #2c). */
- return (pstr_srch_ix);
- }
- srch_len = str_len - srch_str_len; /* Determine srch len (see Note #2d1). */
- srch_ix = 0;
- srch_done = DEF_NO;
- while ((srch_done == DEF_NO) && (srch_ix <= srch_len)) {
- pstr_srch_ix = (CPU_CHAR *)(pstr + srch_ix);
- srch_cmp = Str_Cmp_N(pstr_srch_ix, psrch_str, srch_str_len);
- srch_done = (srch_cmp == 0) ? DEF_YES : DEF_NO;
- srch_ix++;
- }
- if (srch_cmp != 0) { /* If srch str NOT found, rtn NULL (see Note #2d). */
- return ((CPU_CHAR *)0);
- }
- return (pstr_srch_ix); /* Rtn ptr to srch str found in str (see Note #2e). */
- }
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * Str_FmtNbr_32()
- *
- * Description : Format number into a multi-digit character string.
- *
- * Argument(s) : nbr Number to format (see Note #1).
- *
- * nbr_dig Number of integer digits to format (see Note #2).
- *
- * nbr_dp Number of decimal point digits to format.
- *
- * lead_zeros Prepend leading zeros option (DEF_YES/DEF_NO) [see Note #3].
- *
- * nul NULL-character terminate option (DEF_YES/DEF_NO) [see Note #4].
- *
- * pstr_fmt Pointer to character array to return formatted number string (see Note #5).
- *
- * Return(s) : Pointer to formatted string, if NO errors (see Note #6).
- *
- * Pointer to NULL, otherwise.
- *
- * Caller(s) : Application.
- *
- * Note(s) : (1) (a) The maximum accuracy for 32-bit floating-point numbers :
- *
- *
- * Maximum Accuracy log [Internal-Base ^ (Number-Internal-Base-Digits)]
- * 32-bit Floating-point Number = -----------------------------------------------------
- * log [External-Base]
- *
- * log [2 ^ 24]
- * = --------------
- * log [10]
- *
- * < 7.225 Base-10 Digits
- *
- * where
- * Internal-Base Internal number base of floating-
- * point numbers (i.e. 2)
- * External-Base External number base of floating-
- * point numbers (i.e. 10)
- * Number-Internal-Base-Digits Number of internal number base
- * significant digits (i.e. 24)
- *
- * (b) Some compilers' floating-point routines MAY further reduce the maximum accuracy.
- *
- * (c) If the total number of digits to format ('nbr_dig + nbr_dp') is greater than the
- * maximum accuracy; digits following the first, significantly-accurate digits will
- * be inaccurate.
- *
- * (2) (a) If the number of digits to format ('nbr_dig') is less than the number of significant
- * integer digits of the number to format ('nbr'); then the most-significant digits of
- * the formatted number will be truncated.
- *
- * Example :
- *
- * nbr = 23456.789
- * nbr_dig = 3
- * nbr_dp = 2
- *
- * pstr_fmt = "456.78"
- *
- * (b) If number to format ('nbr') is negative but the most-significant digits of the
- * formatted number are truncated (see Note #2a); the negative sign still prefixes
- * the truncated formatted number.
- *
- * Example :
- *
- * nbr = -23456.789
- * nbr_dig = 3
- * nbr_dp = 2
- *
- * pstr_fmt = "-456.78"
- *
- * (3) (a) Leading zeros option prepends leading '0's prior to the first non-zero digit.
- * The number of leading zeros is such that the total number integer digits is
- * equal to the requested number of integer digits to format ('nbr_dig').
- *
- * (b) (1) If leading zeros option DISABLED, ...
- * (2) ... number of digits to format is non-zero, ...
- * (3) ... & the integer value of the number to format is zero; ...
- * (4) ... then one digit of '0' value is formatted.
- *
- * This is NOT a leading zero; but a single integer digit of '0' value.
- *
- * (4) (a) NULL-character terminate option DISABLED prevents overwriting previous character
- * array formatting.
- *
- * (b) WARNING: Unless 'pstr_fmt' character array is pre-/post-terminated, NULL-character
- * terminate option DISABLED will cause character string run-on.
- *$PAGE*
- * (5) (a) Format buffer size NOT validated; buffer overruns MUST be prevented by caller.
- *
- * (b) To prevent character buffer overrun :
- *
- * Character array size MUST be >= ('nbr_dig' +
- * 'nbr_dp' +
- * 1 negative sign +
- * 1 decimal point +
- * 1 'NUL' terminator) characters
- *
- * (6) String format terminates when :
- *
- * (a) Format string pointer is passed a NULL pointer.
- * (1) No string format performed; NULL pointer returned.
- *
- * (b) Number successfully formatted into character string array.
- *********************************************************************************************************
- */
- #if (LIB_STR_CFG_FP_EN == DEF_ENABLED)
- CPU_CHAR *Str_FmtNbr_32 (CPU_FP32 nbr,
- CPU_INT08U nbr_dig,
- CPU_INT08U nbr_dp,
- CPU_BOOLEAN lead_zeros,
- CPU_BOOLEAN nul,
- CPU_CHAR *pstr_fmt)
- {
- CPU_CHAR *pstr;
- CPU_INT08U i;
- CPU_INT32U dig_nbr;
- CPU_INT32U dig_val;
- CPU_FP32 dig_exp;
- CPU_FP32 dp_exp;
- /* Rtn NULL if str ptr NULL (see Note #6a). */
- if (pstr_fmt == (CPU_CHAR *)0) {
- return ((CPU_CHAR *)0);
- }
- pstr = pstr_fmt;
- if (nbr < 0.0) { /* If nbr neg, ... */
- if ((nbr_dig > 0) || /* ... & at least one dig ... */
- (nbr_dp > 0)) { /* ... or at least one dp; ... */
- nbr = -nbr; /* ... negate nbr & ... */
- *pstr++ = '-'; /* ... prefix with neg sign (see Note #2b). */
- }
- }
- if (nbr_dig > 0) {
- dig_exp = 1.0;
- for (i = 1; i < nbr_dig; i++) {
- dig_exp *= 10.0;
- }
- for (i = nbr_dig; i > 0; i--) { /* Fmt str for desired nbr digs. */
- dig_nbr = (CPU_INT32U)(nbr / dig_exp);
- if ((dig_nbr > 0) || /* If dig nbr > 0, ... */
- (nbr_dig == 1) || /* ... OR exactly 1 dig to fmt, ... */
- (i == 1) || /* ... OR on one's dig to fmt, ... */
- (lead_zeros == DEF_YES)) { /* ... OR lead zeros opt ENABLED (see Note #3), ... */
- /* ... calc & fmt dig val. */
- dig_val = (CPU_INT32U)(dig_nbr % 10 );
- *pstr++ = (CPU_CHAR )(dig_val + '0');
- }
- dig_exp /= 10.0; /* Shift to next least-significant dig. */
- }
- }
- if (nbr_dp > 0) {
- *pstr++ = '.'; /* Append dp prior to dp conversion. */
- dp_exp = 10.0;
- for (i = 0; i < nbr_dp; i++) { /* Fmt str for desired nbr dp. */
- dig_nbr = (CPU_INT32U)(nbr * dp_exp );
- dig_val = (CPU_INT32U)(dig_nbr % 10 );
- *pstr++ = (CPU_CHAR )(dig_val + '0');
- dp_exp *= 10.0; /* Shift to next least-significant dp. */
- }
- }
- if (nul != DEF_NO) { /* If NOT DISABLED, append NULL char (see Note #4). */
- *pstr = (CPU_CHAR)0;
- }
- return (pstr_fmt);
- }
- #endif