kc3-lang/gnulib/lib/szprintf.c

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• Hash : 7b089321
  Author :
  Date : 2025-01-01T09:24:36
  

  maint: run 'make update-copyright'
  

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• lib/szprintf.c

• /* Formatted output to strings.
     Copyright (C) 2004, 2006-2025 Free Software Foundation, Inc.
  
     This file is free software: you can redistribute it and/or modify
     it under the terms of the GNU Lesser General Public License as
     published by the Free Software Foundation, either version 3 of the
     License, or (at your option) any later version.
  
     This file is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  #ifdef HAVE_CONFIG_H
  # include <config.h>
  #endif
  
  /* Specification.  */
  #include <stdio.h>
  
  #include <errno.h>
  #include <stdarg.h>
  #include <stdint.h>
  #include <stdlib.h>
  
  #include "vasnprintf.h"
  
  ptrdiff_t
  szprintf (char *str, const char *format, ...)
  {
    char *output;
    size_t len;
    size_t lenbuf;
    va_list args;
  
    /* Set lenbuf = min (SIZE_MAX, - (uintptr_t) str - 1).  */
    lenbuf = SIZE_MAX;
    if (lenbuf >= ~ (uintptr_t) str)
      lenbuf = ~ (uintptr_t) str;
  
    va_start (args, format);
    output = vasnprintf (str, &lenbuf, format, args);
    len = lenbuf;
    va_end (args);
  
    if (!output)
      return -1;
  
    if (output != str)
      {
        /* len is near SIZE_MAX.  */
        free (output);
        errno = ENOMEM;
        return -1;
      }
  
    if (len > PTRDIFF_MAX)
      {
        errno = ENOMEM;
        return -1;
      }
  
    return len;
  }
  

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