Une petite note qui suit printf

supposition

Exemple de code

test2.c


#include <stdio.h>

int main(int arg, char *argv[]){
        printf("hello\n");
}

Note

--Il existe de nombreuses définitions de fonctions standard dans stdio.h

Code Linux etc.

command


ubuntu# ls /usr/include | grep stdio
stdio.h
stdio_ext.h

/usr/include/stdio.h


/* Define ISO C stdio on top of C++ iostreams.
   Copyright (C) 1991-2016 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library 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 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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 the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

command


ubuntu# find . -name "stdio.h"
./include/stdio.h
./libio/stdio.h
./libio/bits/stdio.h

commmand


ubuntu# readelf -a /usr/lib/x86_64-linux-gnu/libc.a | grep printf | grep -v "[a-z_]printf"
     9: 0000000000000480  9125 FUNC    LOCAL  DEFAULT    1 printf_positional
Fichier: libc.a(printf_fp.o)
Fichier: libc.a(reg-printf.o)
Fichier: libc.a(printf-prs.o)
Fichier: libc.a(printf_fphex.o)
Fichier: libc.a(printf_size.o)
    28: 0000000000000000  2223 FUNC    GLOBAL DEFAULT    1 printf_size
    29: 00000000000008b0    31 FUNC    GLOBAL DEFAULT    1 printf_size_info
Fichier: libc.a(printf.o)
    11: 0000000000000000   158 FUNC    GLOBAL DEFAULT    1 printf
    10: 0000000000000370 10733 FUNC    LOCAL  DEFAULT    1 printf_positional
Fichier: libc.a(printf-parsemb.o)
Fichier: libc.a(printf-parsewc.o)
Fichier: libc.a(printf_chk.o)

command


# find . -name "*printf.c" | grep comm
./stdio-common/fprintf.c
./stdio-common/asprintf.c
./stdio-common/printf.c
./stdio-common/reg-printf.c
./stdio-common/tst-obprintf.c
./stdio-common/tst-swprintf.c
./stdio-common/tst-wc-printf.c
./stdio-common/fxprintf.c
./stdio-common/vprintf.c
./stdio-common/vfwprintf.c
./stdio-common/dprintf.c
./stdio-common/vfprintf.c
./stdio-common/test-vfprintf.c
./stdio-common/sprintf.c
./stdio-common/tst-printf.c
./stdio-common/tst-sprintf.c
./stdio-common/snprintf.c

stdio-common/printf.c(Extrait)


/* Write formatted output to stdout from the format string FORMAT.  */
/* VARARGS1 */
int
__printf (const char *format, ...)
{
  va_list arg;
  int done;

  va_start (arg, format);
  done = vfprintf (stdout, format, arg);
  va_end (arg);

  return done;
}

référence

Langage C vraiment effrayant
< a href = "http://www.amazon.co.jp/exec/obidos/ASIN/B00O8GILDK/kuredev-22/ref=nosim/" name = "amazletlink" target = "_ blank"> Langage C vraiment effrayant a>
publié avec amazlet à 17.09.10
Hidekazu System (2014-10- 07)
Classement des ventes: 101 714
Voir les détails sur Amazon.co.jp

Bonjour "Hello, World" OS et slogan et mécanisme de bibliothèque standard
publié avec amazlet le 17.09.10
Hiroaki Sakai
Hidekazu System
Classement des ventes: 48 784
Voir les détails sur Amazon.co.jp

Répertoire et nom du fichier où la glibc est installée | Note d'hydrocul https://hydrocul.github.io/wiki/blog/2016/0220-glibc-filename.html