lib_bsprintf

This function is mainly used to output the contents of the input structure. Supports standard formats for printf and scanf. For detailed parameters, see:

special:
1. Float use %hf, “%f” or “%lf” is double, “%Lf” is long double.
2. The char array is specified with %.xs. for example: “char t[30]” is specified with “%.30s”, char a [20] - " %.20s "
3. “%u” is unsigned int.
4. “%d” is int.
5. When using %f to format a double data type, the double is truncated to 6 decimal places by default.
6. It is recommended that the “char[]” array be placed at the end of the structure to prevent parameter configuration errors such as “%.20s” from causing problems in parsing the entire buffer.

demo

struct:

begin_packed_struct
struct test
{
  uint8_t a;
  uint16_t b;
  uint32_t c;
  int8_t d;
  int16_t e;
  int32_t f;
  float g;
  double h;
  char i[32];
  uint64_t j;
  int64_t k;
  char l;
  unsigned char m;
  short int n;
  unsigned short int o;
  int p;
  unsigned int q;
  long r;
  unsigned long s;
  long long t;
  unsigned long long u;
  size_t v;
  long double w;
}end_packed_struct;

format string:

const char* sg = "           uint8_t:[%hhu]\n" \
                 "          uint16_t:[%hu]\n" \
                 "          uint32_t:[%u]\n" \
                 "            int8_t:[%hhd]\n" \
                 "           int16_t:[%hd]\n" \
                 "           int32_t:[%d]\n" \
                 "             float:[%hf]\n" \
                 "            double:[%f]\n" \
                 "            char[]:[%.32s]\n" \
                 "          uint64_t:[%lu]\n" \
                 "           int64_t:[%ld]\n" \
                 "              char:[%hhd]\n" \
                 "     unsigned char:[%hhu]\n" \
                 "         short int:[%hd]\n" \
                 "unsigned short int:[%hu]\n" \
                 "               int:[%d]\n" \
                 "      unsigned int:[%u]\n" \
                 "              long:[%ld]\n" \
                 "     unsigned long:[%lu]\n" \
                 "         long long:[%lld]\n" \
                 "unsigned long long:[%llu]\n" \
                 "            size_t:[%uz]\n" \
                 "       long double:[%Lf]\n";

use:

output to terminal:

#ifdef CONFIG_FILE_STREAM
 struct lib_stdoutstream_s stdoutstream;

 lib_stdoutstream(&stdoutstream, stdout);

 flockfile(stdout);
 lib_bsprintf(&stdoutstream.common, sv, &test_v);
 lib_bsprintf(&stdoutstream.common, sg, &test_g);
 funlockfile(stdout);
#else
 struct lib_rawoutstream_s rawoutstream;
 struct lib_bufferedoutstream_s outstream;

 lib_rawoutstream(&rawoutstream, STDOUT_FILENO);
 lib_bufferedoutstream(&outstream, &rawoutstream.common);

 lib_bsprintf(&outstream.common, sv, &test_v);
 lib_bsprintf(&outstream.common, sg, &test_g);

 lib_stream_flush(&outstream.common);
#endif

lib_bscanf

This function adds a formatted standard scanf string to the structure(lib_bscanf).

https://zh.cppreference.com/w/c/io/fscanf

special:
1. Please use %lf for double precision, “%hf” or “%f” for float, long double (“%Lf”) is not supported.
2. Please use %hhd or %hhu for a single char or unsigned char.
3. Use %hd or %hu for short int or unsigned short int.
4. When using %s or %c, please specify the length of the char array, such as %32s, %32c.
5. %s will check the string for spaces. When there are spaces in the string, it will be truncated. If you want to use string with spaces, please use %{length}c, but make sure that the length of the string can fill the array, otherwise an error will occur.
6. %[] collection and %n are not supported.

demo

struct: Same as above
format string:

#define TOSTR(str)   #str
#define TONNAME(name) TOSTR(name)

#define v_uint8_t    97
#define v_uint16_t   19299
#define v_uint32_t   22155

......

#define v_l_double   -9299.9299929912122464755474

char bflag[] = "%hhu%hu%u%hhd%hd%d%f%lf%32s%llu%lld%hhd%hhu%hd%hu%d%u%ld%lu%lld%llu%zu%ld";

char binput[] = TONNAME(v_uint8_t) \
               " " TONNAME(v_uint16_t) \
               " " TONNAME(v_uint32_t) \
               " " TONNAME(v_int8_t) \
               " " TONNAME(v_int16_t) \
               " " TONNAME(v_int32_t) \
               " " TONNAME(v_float) \
               " " TONNAME(v_double) \
               " " TONNAME(v_char_arr) \
               " " TONNAME(v_uint64_t) \
               " " TONNAME(v_int64_t) \
               " " TONNAME(v_char) \
               " " TONNAME(v_u_char) \
               " " TONNAME(v_s_int) \
               " " TONNAME(v_u_s_int) \
               " " TONNAME(v_int) \
               " " TONNAME(v_u_int) \
               " " TONNAME(v_long) \
               " " TONNAME(v_u_long) \
               " " TONNAME(v_l_l) \
               " " TONNAME(v_u_l_l) \
               " " TONNAME(v_size_t) \
               " " TONNAME(v_l_double);

use:

struct test vg;
ret = lib_bscanf(binput, bflag, &vg);