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git/compat/fopen.c
Ramsay Jones b0a642ac46 git_fopen: fix a sparse 'not declared' warning
If git is built with the FREAD_READS_DIRECTORIES build variable set, this
would cause sparse to issue a 'not declared, should it be static?' warning
on Linux. This is a result of the method employed by 'compat/fopen.c' to
suppress the (possible) redefinition of the (system) fopen macro, which
also removes the extern declaration of the git_fopen function.

In order to suppress the warning, introduce a new macro to suppress the
definition (or possibly the re-definition) of the fopen symbol as a macro
override. This new macro (SUPPRESS_FOPEN_REDEFINITION) is only defined in
'compat/fopen.c', just prior to the inclusion of the 'git-compat-util.h'
header file.

Signed-off-by: Ramsay Jones <ramsay@ramsayjones.plus.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-05-26 12:33:55 +09:00

37 lines
938 B
C

/*
* The order of the following two lines is important.
*
* SUPPRESS_FOPEN_REDEFINITION is defined before including git-compat-util.h
* to avoid the redefinition of fopen within git-compat-util.h. This is
* necessary since fopen is a macro on some platforms which may be set
* based on compiler options. For example, on AIX fopen is set to fopen64
* when _LARGE_FILES is defined. The previous technique of merely undefining
* fopen after including git-compat-util.h is inadequate in this case.
*/
#define SUPPRESS_FOPEN_REDEFINITION
#include "../git-compat-util.h"
FILE *git_fopen(const char *path, const char *mode)
{
FILE *fp;
struct stat st;
if (mode[0] == 'w' || mode[0] == 'a')
return fopen(path, mode);
if (!(fp = fopen(path, mode)))
return NULL;
if (fstat(fileno(fp), &st)) {
fclose(fp);
return NULL;
}
if (S_ISDIR(st.st_mode)) {
fclose(fp);
errno = EISDIR;
return NULL;
}
return fp;
}