sprintf_deprecated

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <inttypes.h>
#include <ctype.h>

//  MARK: - Definitions.
typedef uint8_t octet;

int snap(FILE * fp, void const * opvar, size_t op_l);

/*
 *  MARK: main()
 */
int main(int argc, char const * argv[]) {
  char bfr[1024] = { '\0', };
  size_t bfr_sz = sizeof bfr / sizeof *bfr;
  int onek = 1024;
  double G333 = 6.333;
  char const * alan_kana = "アラン";
  char const * alan_kanaU = "\u30a2\u30e9\u30f3"; // UTF-8: 0xE3 0x82 0xA2 - 0xE3 0x83 0xA9 - 0xE3 0x83 0xB3
  char const * alan_hira = "あらん";
  char const * alan_hiraU = "\u3042\u3089\u3093"; // UTF-8: 0xE3 0x81 0x82 - 0xE3 0x82 0x89 - 0xE3 0x82 0x93

  sprintf(bfr, "%5d %7.3f %08x %s %s", onek, G333, onek, alan_kana, alan_hira);
  printf("%4zu: %s\n", strlen(bfr), bfr);

  snprintf(bfr, bfr_sz, "%5d %7.3f %08x %s %s", onek, G333, onek, alan_kanaU, alan_hiraU);
  printf("%4zu: %s\n", strlen(bfr), bfr);

  snap(stdout, bfr, strlen(bfr) + 1);

  return 0;
}

/*
 *  MARK: snap()
 *  SVC 51 (0A33)
 */
int snap(FILE * fp, void const * opvar, size_t op_l) {

  octet const * op = (octet const *) opvar;
  int chr_ct = 0;

  size_t const LL = 0x20; //  snap line length (32)
  size_t const GP = 0x08; //  distance between print gaps
  octet const * op_end = op + op_l;
  octet const * op_now = op;

  chr_ct += fprintf(fp, "%p:\n", (void *) op);
  while (op_now < op_end) {
    octet const * hex_p = op_now;
    octet const * chr_p = op_now;

    chr_ct += fprintf(fp, "%04" PRIxPTR ": ", hex_p - op);
    for (size_t xc = 0, sp = 1; xc < LL; ++xc) {
      octet const * loc = hex_p++;
      if (loc < op_end) {
        octet x_ = *loc;
        chr_ct += fprintf(fp, "%02" PRIx8 "%s", x_, (sp++ % GP == 0) ? " " : "");
      }
      else {
        chr_ct += fprintf(fp, "  %s", (sp++ % GP == 0) ? " " : "");
      }
    }
    chr_ct += fprintf(fp, " ");

    for (size_t cc = 0, sp = 1; cc < LL; ++cc) {
      octet const * loc = chr_p++;
      octet c_ = loc < op_end ? *loc : ' ';
      chr_ct += fprintf(fp, "%c%s", isprint(c_) ? c_ : '.', (sp++ % GP == 0) ? " " : "");
    }
    chr_ct += fprintf(fp, "\n");
    op_now += LL;
  }
  chr_ct += fprintf(fp, "\n");

  return chr_ct;
}

/*
$ clang -Wall -Wpedantic -Werror=vla -fsanitize=address -std=gnu2x -o ../bin/sprintf_dep sprintf_dep.c && ../bin/sprintf_dep
sprintf_dep.c:26:3: warning: 'sprintf' is deprecated: This function is provided for compatibility reasons only.  Due to security concerns inherent in the design of sprintf(3), it is highly recommended that you use snprintf(3) instead. [-Wdeprecated-declarations]
  sprintf(bfr, "%5d %7.3f %08x %s %s", onek, G333, onek, alan_kana, alan_hira);
  ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/stdio.h:188:1: note: 'sprintf' has been explicitly marked deprecated here
__deprecated_msg("This function is provided for compatibility reasons only.  Due to security concerns inherent in the design of sprintf(3), it is highly recommended that you use snprintf(3) instead.")
^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/sys/cdefs.h:215:48: note: expanded from macro '__deprecated_msg'
        #define __deprecated_msg(_msg) __attribute__((__deprecated__(_msg)))
                                                      ^
1 warning generated.
sprintf_dep(12209,0x114b9d600) malloc: nano zone abandoned due to inability to preallocate reserved vm space.
  42:  1024   6.333 00000400 アラン あらん
  42:  1024   6.333 00000400 アラン あらん
0x7ff7b7269ec0:
0000: 2031303234202020 362e333333203030 30303034303020e3 82a2e383a9e383b3   1024    6.333 00 000400 . ........
0020: 20e38182e38289e3 829300                                               ....... ...
$
*/