/* * Copyright (c) 2006-2021, RT-Thread Development Team * * SPDX-License-Identifier: Apache-2.0 * * Change Logs: * Date Author Notes * 2006-03-16 Bernard the first version * 2006-05-25 Bernard rewrite vsprintf * 2006-08-10 Bernard add rt_show_version * 2010-03-17 Bernard remove rt_strlcpy function * fix gcc compiling issue. * 2010-04-15 Bernard remove weak definition on ICCM16C compiler * 2012-07-18 Arda add the alignment display for signed integer * 2012-11-23 Bernard fix IAR compiler error. * 2012-12-22 Bernard fix rt_kprintf issue, which found by Grissiom. * 2013-06-24 Bernard remove rt_kprintf if RT_USING_CONSOLE is not defined. * 2013-09-24 aozima make sure the device is in STREAM mode when used by rt_kprintf. * 2015-07-06 Bernard Add rt_assert_handler routine. * 2021-02-28 Meco Man add RT_KSERVICE_USING_STDLIB */ #include #include #ifdef RT_USING_MODULE #include #endif /* RT_USING_MODULE */ /* use precision */ #define RT_PRINTF_PRECISION /** * @addtogroup KernelService */ /**@{*/ /* global errno in RT-Thread */ static volatile int __rt_errno; #if defined(RT_USING_DEVICE) && defined(RT_USING_CONSOLE) static rt_device_t _console_device = RT_NULL; #endif /** * This function gets the global errno for the current thread. * * @return errno */ rt_err_t rt_get_errno(void) { rt_thread_t tid; if (rt_interrupt_get_nest() != 0) { /* it's in interrupt context */ return __rt_errno; } tid = rt_thread_self(); if (tid == RT_NULL) return __rt_errno; return tid->error; } RTM_EXPORT(rt_get_errno); /** * This function sets the global errno for the current thread. * * @param error is the errno shall be set. */ void rt_set_errno(rt_err_t error) { rt_thread_t tid; if (rt_interrupt_get_nest() != 0) { /* it's in interrupt context */ __rt_errno = error; return; } tid = rt_thread_self(); if (tid == RT_NULL) { __rt_errno = error; return; } tid->error = error; } RTM_EXPORT(rt_set_errno); /** * This function returns the address of the current thread errno. * * @return The errno address. */ int *_rt_errno(void) { rt_thread_t tid; if (rt_interrupt_get_nest() != 0) return (int *)&__rt_errno; tid = rt_thread_self(); if (tid != RT_NULL) return (int *) & (tid->error); return (int *)&__rt_errno; } RTM_EXPORT(_rt_errno); /** * This function will set the content of memory to specified value. * * @param s is the address of source memory, point to the memory block to be filled. * * @param c is the value to be set. The value is passed in int form, but the function * uses the unsigned character form of the value when filling the memory block. * * @param count number of bytes to be set. * * @return The address of source memory. */ RT_WEAK void *rt_memset(void *s, int c, rt_ubase_t count) { #ifdef RT_KSERVICE_USING_TINY_SIZE char *xs = (char *)s; while (count--) *xs++ = c; return s; #else #define LBLOCKSIZE (sizeof(long)) #define UNALIGNED(X) ((long)X & (LBLOCKSIZE - 1)) #define TOO_SMALL(LEN) ((LEN) < LBLOCKSIZE) unsigned int i; char *m = (char *)s; unsigned long buffer; unsigned long *aligned_addr; unsigned int d = c & 0xff; /* To avoid sign extension, copy C to an unsigned variable. */ if (!TOO_SMALL(count) && !UNALIGNED(s)) { /* If we get this far, we know that count is large and s is word-aligned. */ aligned_addr = (unsigned long *)s; /* Store d into each char sized location in buffer so that * we can set large blocks quickly. */ if (LBLOCKSIZE == 4) { buffer = (d << 8) | d; buffer |= (buffer << 16); } else { buffer = 0; for (i = 0; i < LBLOCKSIZE; i ++) buffer = (buffer << 8) | d; } while (count >= LBLOCKSIZE * 4) { *aligned_addr++ = buffer; *aligned_addr++ = buffer; *aligned_addr++ = buffer; *aligned_addr++ = buffer; count -= 4 * LBLOCKSIZE; } while (count >= LBLOCKSIZE) { *aligned_addr++ = buffer; count -= LBLOCKSIZE; } /* Pick up the remainder with a bytewise loop. */ m = (char *)aligned_addr; } while (count--) { *m++ = (char)d; } return s; #undef LBLOCKSIZE #undef UNALIGNED #undef TOO_SMALL #endif /* RT_KSERVICE_USING_TINY_SIZE */ } RTM_EXPORT(rt_memset); #ifndef RT_USING_ASM_MEMCPY /** * This function will copy memory content from source address to destination address. * * @param dst is the address of destination memory, points to the copied content. * * @param src is the address of source memory, pointing to the data source to be copied. * * @param count is the copied length. * * @return The address of destination memory */ void *rt_memcpy(void *dst, const void *src, rt_ubase_t count) { #ifdef RT_KSERVICE_USING_TINY_SIZE char *tmp = (char *)dst, *s = (char *)src; rt_ubase_t len; if (tmp <= s || tmp > (s + count)) { while (count--) *tmp ++ = *s ++; } else { for (len = count; len > 0; len --) tmp[len - 1] = s[len - 1]; } return dst; #else #define UNALIGNED(X, Y) \ (((long)X & (sizeof (long) - 1)) | ((long)Y & (sizeof (long) - 1))) #define BIGBLOCKSIZE (sizeof (long) << 2) #define LITTLEBLOCKSIZE (sizeof (long)) #define TOO_SMALL(LEN) ((LEN) < BIGBLOCKSIZE) char *dst_ptr = (char *)dst; char *src_ptr = (char *)src; long *aligned_dst; long *aligned_src; int len = count; /* If the size is small, or either SRC or DST is unaligned, then punt into the byte copy loop. This should be rare. */ if (!TOO_SMALL(len) && !UNALIGNED(src_ptr, dst_ptr)) { aligned_dst = (long *)dst_ptr; aligned_src = (long *)src_ptr; /* Copy 4X long words at a time if possible. */ while (len >= BIGBLOCKSIZE) { *aligned_dst++ = *aligned_src++; *aligned_dst++ = *aligned_src++; *aligned_dst++ = *aligned_src++; *aligned_dst++ = *aligned_src++; len -= BIGBLOCKSIZE; } /* Copy one long word at a time if possible. */ while (len >= LITTLEBLOCKSIZE) { *aligned_dst++ = *aligned_src++; len -= LITTLEBLOCKSIZE; } /* Pick up any residual with a byte copier. */ dst_ptr = (char *)aligned_dst; src_ptr = (char *)aligned_src; } while (len--) *dst_ptr++ = *src_ptr++; return dst; #undef UNALIGNED #undef BIGBLOCKSIZE #undef LITTLEBLOCKSIZE #undef TOO_SMALL #endif /* RT_KSERVICE_USING_TINY_SIZE */ } RTM_EXPORT(rt_memcpy); #endif /* RT_USING_ASM_MEMCPY */ #ifndef RT_KSERVICE_USING_STDLIB /** * This function will move memory content from source address to destination * address. If the destination memory does not overlap with the source memory, * the function is the same as memcpy(). * * @param dest is the address of destination memory, points to the copied content. * * @param src is the address of source memory, point to the data source to be copied. * * @param n is the copied length. * * @return The address of destination memory. */ void *rt_memmove(void *dest, const void *src, rt_ubase_t n) { char *tmp = (char *)dest, *s = (char *)src; if (s < tmp && tmp < s + n) { tmp += n; s += n; while (n--) *(--tmp) = *(--s); } else { while (n--) *tmp++ = *s++; } return dest; } RTM_EXPORT(rt_memmove); /** * This function will compare two areas of memory. * * @param cs is a block of memory. * * @param ct is another block of memory. * * @param count is the size of the area. * * @return Compare the results: * If the result < 0, cs is smaller than ct. * If the result > 0, cs is greater than ct. * If the result = 0, cs is equal to ct. */ RT_WEAK rt_int32_t rt_memcmp(const void *cs, const void *ct, rt_ubase_t count) { const unsigned char *su1, *su2; int res = 0; for (su1 = (const unsigned char *)cs, su2 = (const unsigned char *)ct; 0 < count; ++su1, ++su2, count--) if ((res = *su1 - *su2) != 0) break; return res; } RTM_EXPORT(rt_memcmp); /** * This function will return the first occurrence of a string, without the * terminator '\0'. * * @param s1 is the source string. * * @param s2 is the find string. * * @return The first occurrence of a s2 in s1, or RT_NULL if no found. */ char *rt_strstr(const char *s1, const char *s2) { int l1, l2; l2 = rt_strlen(s2); if (!l2) return (char *)s1; l1 = rt_strlen(s1); while (l1 >= l2) { l1 --; if (!rt_memcmp(s1, s2, l2)) return (char *)s1; s1 ++; } return RT_NULL; } RTM_EXPORT(rt_strstr); /** * This function will compare two strings while ignoring differences in case * * @param a is the string to be compared. * * @param b is the string to be compared. * * @return Compare the results: * If the result < 0, a is smaller than a. * If the result > 0, a is greater than a. * If the result = 0, a is equal to a. */ rt_int32_t rt_strcasecmp(const char *a, const char *b) { int ca, cb; do { ca = *a++ & 0xff; cb = *b++ & 0xff; if (ca >= 'A' && ca <= 'Z') ca += 'a' - 'A'; if (cb >= 'A' && cb <= 'Z') cb += 'a' - 'A'; } while (ca == cb && ca != '\0'); return ca - cb; } RTM_EXPORT(rt_strcasecmp); /** * This function will copy string no more than n bytes. * * @param dst points to the address used to store the copied content. * * @param src is the string to be copied. * * @param n is the maximum copied length. * * @return The address where the copied content is stored. */ char *rt_strncpy(char *dst, const char *src, rt_ubase_t n) { if (n != 0) { char *d = dst; const char *s = src; do { if ((*d++ = *s++) == 0) { /* NUL pad the remaining n-1 bytes */ while (--n != 0) *d++ = 0; break; } } while (--n != 0); } return (dst); } RTM_EXPORT(rt_strncpy); /** * This function will compare two strings with specified maximum length. * * @param cs is the string to be compared. * * @param ct is the string to be compared. * * @param count is the maximum compare length. * * @return Compare the results: * If the result < 0, cs is smaller than ct. * If the result > 0, cs is greater than ct. * If the result = 0, cs is equal to ct. */ rt_int32_t rt_strncmp(const char *cs, const char *ct, rt_ubase_t count) { register signed char __res = 0; while (count) { if ((__res = *cs - *ct++) != 0 || !*cs++) break; count --; } return __res; } RTM_EXPORT(rt_strncmp); /** * This function will compare two strings without specified length. * * @param cs is the string to be compared. * * @param ct is the string to be compared. * * @return Compare the results: * If the result < 0, cs is smaller than ct. * If the result > 0, cs is greater than ct. * If the result = 0, cs is equal to ct. */ rt_int32_t rt_strcmp(const char *cs, const char *ct) { while (*cs && *cs == *ct) { cs++; ct++; } return (*cs - *ct); } RTM_EXPORT(rt_strcmp); /** * The strnlen() function returns the number of characters in the * string pointed to by s, excluding the terminating null byte ('\0'), * but at most maxlen. In doing this, strnlen() looks only at the * first maxlen characters in the string pointed to by s and never * beyond s+maxlen. * * @param s is the string. * * @param maxlen is the max size. * * @return The length of string. */ rt_size_t rt_strnlen(const char *s, rt_ubase_t maxlen) { const char *sc; for (sc = s; *sc != '\0' && (rt_ubase_t)(sc - s) < maxlen; ++sc) /* nothing */ ; return sc - s; } RTM_EXPORT(rt_strnlen); /** * This function will return the length of a string, which terminate will * null character. * * @param s is the string * * @return The length of string. */ rt_size_t rt_strlen(const char *s) { const char *sc; for (sc = s; *sc != '\0'; ++sc) /* nothing */ ; return sc - s; } RTM_EXPORT(rt_strlen); #endif /* RT_KSERVICE_USING_STDLIB */ #ifdef RT_USING_HEAP /** * This function will duplicate a string. * * @param s is the string to be duplicated. * * @return The string address of the copy. */ char *rt_strdup(const char *s) { rt_size_t len = rt_strlen(s) + 1; char *tmp = (char *)rt_malloc(len); if (!tmp) return RT_NULL; rt_memcpy(tmp, s, len); return tmp; } RTM_EXPORT(rt_strdup); #ifdef __ARMCC_VERSION char *strdup(const char *s) __attribute__((alias("rt_strdup"))); #endif #endif /* RT_USING_HEAP */ /** * This function will show the version of rt-thread rtos */ void rt_show_version(void) { rt_kprintf("\n \\ | /\n"); rt_kprintf("- RT - Thread Operating System\n"); rt_kprintf(" / | \\ %d.%d.%d build %s\n", RT_VERSION, RT_SUBVERSION, RT_REVISION, __DATE__); rt_kprintf(" 2006 - 2021 Copyright by rt-thread team\n"); } RTM_EXPORT(rt_show_version); /* private function */ #define _ISDIGIT(c) ((unsigned)((c) - '0') < 10) #ifdef RT_PRINTF_LONGLONG /** * This function will duplicate a string. * * @param n is the string to be duplicated. * * @param base is support divide instructions value. * * @return the duplicated string pointer. */ rt_inline int divide(long long *n, int base) { int res; /* optimized for processor which does not support divide instructions. */ if (base == 10) { res = (int)(((unsigned long long)*n) % 10U); *n = (long long)(((unsigned long long)*n) / 10U); } else { res = (int)(((unsigned long long)*n) % 16U); *n = (long long)(((unsigned long long)*n) / 16U); } return res; } #else rt_inline int divide(long *n, int base) { int res; /* optimized for processor which does not support divide instructions. */ if (base == 10) { res = (int)(((unsigned long)*n) % 10U); *n = (long)(((unsigned long)*n) / 10U); } else { res = (int)(((unsigned long)*n) % 16U); *n = (long)(((unsigned long)*n) / 16U); } return res; } #endif /* RT_PRINTF_LONGLONG */ rt_inline int skip_atoi(const char **s) { register int i = 0; while (_ISDIGIT(**s)) i = i * 10 + *((*s)++) - '0'; return i; } #define ZEROPAD (1 << 0) /* pad with zero */ #define SIGN (1 << 1) /* unsigned/signed long */ #define PLUS (1 << 2) /* show plus */ #define SPACE (1 << 3) /* space if plus */ #define LEFT (1 << 4) /* left justified */ #define SPECIAL (1 << 5) /* 0x */ #define LARGE (1 << 6) /* use 'ABCDEF' instead of 'abcdef' */ #ifdef RT_PRINTF_PRECISION static char *print_number(char *buf, char *end, #ifdef RT_PRINTF_LONGLONG long long num, #else long num, #endif /* RT_PRINTF_LONGLONG */ int base, int s, int precision, int type) #else static char *print_number(char *buf, char *end, #ifdef RT_PRINTF_LONGLONG long long num, #else long num, #endif /* RT_PRINTF_LONGLONG */ int base, int s, int type) #endif /* RT_PRINTF_PRECISION */ { char c, sign; #ifdef RT_PRINTF_LONGLONG char tmp[32]; #else char tmp[16]; #endif /* RT_PRINTF_LONGLONG */ int precision_bak = precision; const char *digits; static const char small_digits[] = "0123456789abcdef"; static const char large_digits[] = "0123456789ABCDEF"; register int i; register int size; size = s; digits = (type & LARGE) ? large_digits : small_digits; if (type & LEFT) type &= ~ZEROPAD; c = (type & ZEROPAD) ? '0' : ' '; /* get sign */ sign = 0; if (type & SIGN) { if (num < 0) { sign = '-'; num = -num; } else if (type & PLUS) sign = '+'; else if (type & SPACE) sign = ' '; } #ifdef RT_PRINTF_SPECIAL if (type & SPECIAL) { if (base == 16) size -= 2; else if (base == 8) size--; } #endif /* RT_PRINTF_SPECIAL */ i = 0; if (num == 0) tmp[i++] = '0'; else { while (num != 0) tmp[i++] = digits[divide(&num, base)]; } #ifdef RT_PRINTF_PRECISION if (i > precision) precision = i; size -= precision; #else size -= i; #endif /* RT_PRINTF_PRECISION */ if (!(type & (ZEROPAD | LEFT))) { if ((sign) && (size > 0)) size--; while (size-- > 0) { if (buf < end) *buf = ' '; ++ buf; } } if (sign) { if (buf < end) { *buf = sign; } -- size; ++ buf; } #ifdef RT_PRINTF_SPECIAL if (type & SPECIAL) { if (base == 8) { if (buf < end) *buf = '0'; ++ buf; } else if (base == 16) { if (buf < end) *buf = '0'; ++ buf; if (buf < end) { *buf = type & LARGE ? 'X' : 'x'; } ++ buf; } } #endif /* RT_PRINTF_SPECIAL */ /* no align to the left */ if (!(type & LEFT)) { while (size-- > 0) { if (buf < end) *buf = c; ++ buf; } } #ifdef RT_PRINTF_PRECISION while (i < precision--) { if (buf < end) *buf = '0'; ++ buf; } #endif /* RT_PRINTF_PRECISION */ /* put number in the temporary buffer */ while (i-- > 0 && (precision_bak != 0)) { if (buf < end) *buf = tmp[i]; ++ buf; } while (size-- > 0) { if (buf < end) *buf = ' '; ++ buf; } return buf; } /** * This function will fill a formatted string to buffer. * * @param buf is the buffer to save formatted string. * * @param size is the size of buffer. * * @param fmt is the format parameters. * * @param args is a list of variable parameters. * * @return The number of characters actually written to buffer. */ rt_int32_t rt_vsnprintf(char *buf, rt_size_t size, const char *fmt, va_list args) { #ifdef RT_PRINTF_LONGLONG unsigned long long num; #else rt_uint32_t num; #endif /* RT_PRINTF_LONGLONG */ int i, len; char *str, *end, c; const char *s; rt_uint8_t base; /* the base of number */ rt_uint8_t flags; /* flags to print number */ rt_uint8_t qualifier; /* 'h', 'l', or 'L' for integer fields */ rt_int32_t field_width; /* width of output field */ #ifdef RT_PRINTF_PRECISION int precision; /* min. # of digits for integers and max for a string */ #endif /* RT_PRINTF_PRECISION */ str = buf; end = buf + size; /* Make sure end is always >= buf */ if (end < buf) { end = ((char *) - 1); size = end - buf; } for (; *fmt ; ++fmt) { if (*fmt != '%') { if (str < end) *str = *fmt; ++ str; continue; } /* process flags */ flags = 0; while (1) { /* skips the first '%' also */ ++ fmt; if (*fmt == '-') flags |= LEFT; else if (*fmt == '+') flags |= PLUS; else if (*fmt == ' ') flags |= SPACE; else if (*fmt == '#') flags |= SPECIAL; else if (*fmt == '0') flags |= ZEROPAD; else break; } /* get field width */ field_width = -1; if (_ISDIGIT(*fmt)) field_width = skip_atoi(&fmt); else if (*fmt == '*') { ++ fmt; /* it's the next argument */ field_width = va_arg(args, int); if (field_width < 0) { field_width = -field_width; flags |= LEFT; } } #ifdef RT_PRINTF_PRECISION /* get the precision */ precision = -1; if (*fmt == '.') { ++ fmt; if (_ISDIGIT(*fmt)) precision = skip_atoi(&fmt); else if (*fmt == '*') { ++ fmt; /* it's the next argument */ precision = va_arg(args, int); } if (precision < 0) precision = 0; } #endif /* RT_PRINTF_PRECISION */ /* get the conversion qualifier */ qualifier = 0; #ifdef RT_PRINTF_LONGLONG if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L') #else if (*fmt == 'h' || *fmt == 'l') #endif /* RT_PRINTF_LONGLONG */ { qualifier = *fmt; ++ fmt; #ifdef RT_PRINTF_LONGLONG if (qualifier == 'l' && *fmt == 'l') { qualifier = 'L'; ++ fmt; } #endif /* RT_PRINTF_LONGLONG */ } /* the default base */ base = 10; switch (*fmt) { case 'c': if (!(flags & LEFT)) { while (--field_width > 0) { if (str < end) *str = ' '; ++ str; } } /* get character */ c = (rt_uint8_t)va_arg(args, int); if (str < end) *str = c; ++ str; /* put width */ while (--field_width > 0) { if (str < end) *str = ' '; ++ str; } continue; case 's': s = va_arg(args, char *); if (!s) s = "(NULL)"; for (len = 0; (len != field_width) && (s[len] != '\0'); len++); #ifdef RT_PRINTF_PRECISION if (precision > 0 && len > precision) len = precision; #endif /* RT_PRINTF_PRECISION */ if (!(flags & LEFT)) { while (len < field_width--) { if (str < end) *str = ' '; ++ str; } } for (i = 0; i < len; ++i) { if (str < end) *str = *s; ++ str; ++ s; } while (len < field_width--) { if (str < end) *str = ' '; ++ str; } continue; case 'p': if (field_width == -1) { field_width = sizeof(void *) << 1; flags |= ZEROPAD; } #ifdef RT_PRINTF_PRECISION str = print_number(str, end, (long)va_arg(args, void *), 16, field_width, precision, flags); #else str = print_number(str, end, (long)va_arg(args, void *), 16, field_width, flags); #endif /* RT_PRINTF_PRECISION */ continue; case '%': if (str < end) *str = '%'; ++ str; continue; /* integer number formats - set up the flags and "break" */ case 'o': base = 8; break; case 'X': flags |= LARGE; case 'x': base = 16; break; case 'd': case 'i': flags |= SIGN; case 'u': break; default: if (str < end) *str = '%'; ++ str; if (*fmt) { if (str < end) *str = *fmt; ++ str; } else { -- fmt; } continue; } #ifdef RT_PRINTF_LONGLONG if (qualifier == 'L') num = va_arg(args, long long); else if (qualifier == 'l') #else if (qualifier == 'l') #endif /* RT_PRINTF_LONGLONG */ { num = va_arg(args, rt_uint32_t); if (flags & SIGN) num = (rt_int32_t)num; } else if (qualifier == 'h') { num = (rt_uint16_t)va_arg(args, rt_int32_t); if (flags & SIGN) num = (rt_int16_t)num; } else { num = va_arg(args, rt_uint32_t); if (flags & SIGN) num = (rt_int32_t)num; } #ifdef RT_PRINTF_PRECISION str = print_number(str, end, num, base, field_width, precision, flags); #else str = print_number(str, end, num, base, field_width, flags); #endif /* RT_PRINTF_PRECISION */ } if (size > 0) { if (str < end) *str = '\0'; else { end[-1] = '\0'; } } /* the trailing null byte doesn't count towards the total * ++str; */ return str - buf; } RTM_EXPORT(rt_vsnprintf); /** * This function will fill a formatted string to buffer. * * @param buf is the buffer to save formatted string. * * @param size is the size of buffer. * * @param fmt is the format parameters. * * @return The number of characters actually written to buffer. */ rt_int32_t rt_snprintf(char *buf, rt_size_t size, const char *fmt, ...) { rt_int32_t n; va_list args; va_start(args, fmt); n = rt_vsnprintf(buf, size, fmt, args); va_end(args); return n; } RTM_EXPORT(rt_snprintf); /** * This function will fill a formatted string to buffer. * * @param buf is the buffer to save formatted string. * * @param format is the format parameters. * * @param arg_ptr is a list of variable parameters. * * @return The number of characters actually written to buffer. */ rt_int32_t rt_vsprintf(char *buf, const char *format, va_list arg_ptr) { return rt_vsnprintf(buf, (rt_size_t) - 1, format, arg_ptr); } RTM_EXPORT(rt_vsprintf); /** * This function will fill a formatted string to buffer * * @param buf the buffer to save formatted string. * * @param format is the format parameters. * * @return The number of characters actually written to buffer. */ rt_int32_t rt_sprintf(char *buf, const char *format, ...) { rt_int32_t n; va_list arg_ptr; va_start(arg_ptr, format); n = rt_vsprintf(buf, format, arg_ptr); va_end(arg_ptr); return n; } RTM_EXPORT(rt_sprintf); #ifdef RT_USING_CONSOLE #ifdef RT_USING_DEVICE /** * This function returns the device using in console. * * @return Returns the console device pointer or RT_NULL. */ rt_device_t rt_console_get_device(void) { return _console_device; } RTM_EXPORT(rt_console_get_device); /** * This function will set a device as console device. * After set a device to console, all output of rt_kprintf will be * redirected to this new device. * * @param name is the name of new console device. * * @return the old console device handler on successful, or RT_NULL on failure. */ rt_device_t rt_console_set_device(const char *name) { rt_device_t new_device, old_device; /* save old device */ old_device = _console_device; /* find new console device */ new_device = rt_device_find(name); /* check whether it's a same device */ if (new_device == old_device) return RT_NULL; if (new_device != RT_NULL) { if (_console_device != RT_NULL) { /* close old console device */ rt_device_close(_console_device); } /* set new console device */ rt_device_open(new_device, RT_DEVICE_OFLAG_RDWR | RT_DEVICE_FLAG_STREAM); _console_device = new_device; } return old_device; } RTM_EXPORT(rt_console_set_device); #endif /* RT_USING_DEVICE */ RT_WEAK void rt_hw_console_output(const char *str) { /* empty console output */ } RTM_EXPORT(rt_hw_console_output); /** * This function will put string to the console. * * @param str is the string output to the console. */ void rt_kputs(const char *str) { if (!str) return; #ifdef RT_USING_DEVICE if (_console_device == RT_NULL) { rt_hw_console_output(str); } else { rt_device_write(_console_device, 0, str, rt_strlen(str)); } #else rt_hw_console_output(str); #endif /* RT_USING_DEVICE */ } /** * This function will print a formatted string on system console. * * @param fmt is the format parameters. */ RT_WEAK void rt_kprintf(const char *fmt, ...) { va_list args; rt_size_t length; static char rt_log_buf[RT_CONSOLEBUF_SIZE]; va_start(args, fmt); /* the return value of vsnprintf is the number of bytes that would be * written to buffer had if the size of the buffer been sufficiently * large excluding the terminating null byte. If the output string * would be larger than the rt_log_buf, we have to adjust the output * length. */ length = rt_vsnprintf(rt_log_buf, sizeof(rt_log_buf) - 1, fmt, args); if (length > RT_CONSOLEBUF_SIZE - 1) length = RT_CONSOLEBUF_SIZE - 1; #ifdef RT_USING_DEVICE if (_console_device == RT_NULL) { rt_hw_console_output(rt_log_buf); } else { rt_device_write(_console_device, 0, rt_log_buf, length); } #else rt_hw_console_output(rt_log_buf); #endif /* RT_USING_DEVICE */ va_end(args); } RTM_EXPORT(rt_kprintf); #endif /* RT_USING_CONSOLE */ #ifdef RT_USING_HEAP /** * This function allocates a memory block, which address is aligned to the * specified alignment size. * * @param size is the allocated memory block size. * * @param align is the alignment size. * * @return The memory block address was returned successfully, otherwise it was * returned empty RT_NULL. */ RT_WEAK void *rt_malloc_align(rt_size_t size, rt_size_t align) { void *ptr; void *align_ptr; int uintptr_size; rt_size_t align_size; /* sizeof pointer */ uintptr_size = sizeof(void*); uintptr_size -= 1; /* align the alignment size to uintptr size byte */ align = ((align + uintptr_size) & ~uintptr_size); /* get total aligned size */ align_size = ((size + uintptr_size) & ~uintptr_size) + align; /* allocate memory block from heap */ ptr = rt_malloc(align_size); if (ptr != RT_NULL) { /* the allocated memory block is aligned */ if (((rt_ubase_t)ptr & (align - 1)) == 0) { align_ptr = (void *)((rt_ubase_t)ptr + align); } else { align_ptr = (void *)(((rt_ubase_t)ptr + (align - 1)) & ~(align - 1)); } /* set the pointer before alignment pointer to the real pointer */ *((rt_ubase_t *)((rt_ubase_t)align_ptr - sizeof(void *))) = (rt_ubase_t)ptr; ptr = align_ptr; } return ptr; } RTM_EXPORT(rt_malloc_align); /** * This function release the memory block, which is allocated by * rt_malloc_align function and address is aligned. * * @param ptr is the memory block pointer. */ RT_WEAK void rt_free_align(void *ptr) { void *real_ptr; real_ptr = (void *) * (rt_ubase_t *)((rt_ubase_t)ptr - sizeof(void *)); rt_free(real_ptr); } RTM_EXPORT(rt_free_align); #endif /* RT_USING_HEAP */ #ifndef RT_USING_CPU_FFS const rt_uint8_t __lowest_bit_bitmap[] = { /* 00 */ 0, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, /* 10 */ 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, /* 20 */ 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, /* 30 */ 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, /* 40 */ 6, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, /* 50 */ 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, /* 60 */ 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, /* 70 */ 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, /* 80 */ 7, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, /* 90 */ 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, /* A0 */ 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, /* B0 */ 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, /* C0 */ 6, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, /* D0 */ 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, /* E0 */ 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, /* F0 */ 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0 }; /** * This function finds the first bit set (beginning with the least significant bit) * in value and return the index of that bit. * * Bits are numbered starting at 1 (the least significant bit). A return value of * zero from any of these functions means that the argument was zero. * * @return Return the index of the first bit set. If value is 0, then this function * shall return 0. */ int __rt_ffs(int value) { if (value == 0) return 0; if (value & 0xff) return __lowest_bit_bitmap[value & 0xff] + 1; if (value & 0xff00) return __lowest_bit_bitmap[(value & 0xff00) >> 8] + 9; if (value & 0xff0000) return __lowest_bit_bitmap[(value & 0xff0000) >> 16] + 17; return __lowest_bit_bitmap[(value & 0xff000000) >> 24] + 25; } #endif /* RT_USING_CPU_FFS */ #ifdef RT_DEBUG /* RT_ASSERT(EX)'s hook */ void (*rt_assert_hook)(const char *ex, const char *func, rt_size_t line); /** * This function will set a hook function to RT_ASSERT(EX). It will run when the expression is false. * * @param hook is the hook function. */ void rt_assert_set_hook(void (*hook)(const char *ex, const char *func, rt_size_t line)) { rt_assert_hook = hook; } /** * The RT_ASSERT function. * * @param ex_string is the assertion condition string. * * @param func is the function name when assertion. * * @param line is the file line number when assertion. */ void rt_assert_handler(const char *ex_string, const char *func, rt_size_t line) { volatile char dummy = 0; if (rt_assert_hook == RT_NULL) { #ifdef RT_USING_MODULE if (dlmodule_self()) { /* close assertion module */ dlmodule_exit(-1); } else #endif /*RT_USING_MODULE*/ { rt_kprintf("(%s) assertion failed at function:%s, line number:%d \n", ex_string, func, line); while (dummy == 0); } } else { rt_assert_hook(ex_string, func, line); } } RTM_EXPORT(rt_assert_handler); #endif /* RT_DEBUG */ /**@}*/