贡献一个开源的整型数转字符串函数

test01

1. /* This Source Code Form is subject to the terms of the Mozilla Public
   
2. * License, v. 2.0. If a copy of the MPL was not distributed with this
   
3. * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   
4. 
   
5. uint_fast8_t integer_number_to_string (int32_t input_number, char leader_character, uint_fast8_t display_width, char numeric_string[], uint_fast8_t array_len)  //input_number range is INT32_MAX to INT32_MIN. Returns the numeric string length.
   
6. {
   
7.   const uint_fast8_t INTERMEDIATE_MAX_WIDTH = 1 + 10;  //sign + Max significant figures, Max significant figures = int32_t floor(log10(-INT32_MIN)) ＋ 1
   
8.   
   
9.   char intermediate_string[INTERMEDIATE_MAX_WIDTH + 1];
   
10.   
    
11.   if (leader_character < '\x0')
    
12.   {
    
13.     return 0;
    
14.   }
    
15.   if (display_width >= array_len)
    
16.   {
    
17.     return 0;
    
18.   }
    
19.   if (array_len <= 1)
    
20.   {
    
21.     return 0;
    
22.   }
    
23.   
    
24.   #if defined(__cplusplus)
    
25.   int_fast8_t intermediate_len = sprintf(intermediate_string, "%-""li", input_number);
    
26.   #else
    
27.   int_fast8_t intermediate_len = sprintf(intermediate_string, "%-"PRIi32, input_number);
    
28.   #endif
    
29.   if (intermediate_len > display_width)
    
30.   {
    
31.     return 0;
    
32.   }
    
33. 
    
34.   int_fast8_t i = 0;
    
35.   int_fast8_t n = display_width - (intermediate_len + 1);
    
36.   if (isgraph(leader_character))
    
37.   {
    
38.     while (i <= n)
    
39.     {
    
40.       numeric_string[i] = leader_character;
    
41.       ++i;
    
42.     }
    
43.   }
    
44.   n = i + intermediate_len;
    
45.   int_fast8_t j = 0;
    
46.   while (i <= n)
    
47.   {
    
48.     numeric_string[i] = intermediate_string[j];
    
49.     ++i;
    
50.     ++j;
    
51.   }
    
52.   i -= 1;
    
53.   return i;  //Returns the numeric string length
    
54. }

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纯C11草案标准写的，并兼容Arduino
有什么使用问题欢迎留言

test01

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