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amode_to_bmode fixes: support "a", be more restrictive about the position

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of the char (r, w, and a must appear as the first char only)


git-svn-id: svn://svn.cc65.org/cc65/trunk@1271 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cpg 2002-05-16 15:25:48 +00:00
parent f25f2196dd
commit e79d285671
1 changed files with 23 additions and 12 deletions
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35
libsrc/common/_fopen.c
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@ -19,23 +19,33 @@ static unsigned char amode_to_bmode (const char* mode)
char flag = 0;
unsigned char binmode = 0;
c = *mode++;
switch(c) {
case 'w':
binmode = O_WRONLY;
break;
case 'r':
binmode = O_RDONLY;
break;
case 'a':
binmode = O_WRONLY | O_APPEND;
break;
default:
return 0; /* invalid char */
}
while (c = *mode++) {
switch(c) {
case 'w':
binmode = O_WRONLY;
break;
case 'r':
binmode = O_RDONLY;
break;
case '+':
binmode = O_RDWR;
binmode = (binmode & ~15) | O_RDWR;
break;
/* a,b missing */
case 'b':
/* currently ignored */
break;
default:
return 0; /* invalid char */
}
}
if (binmode == 0) {
_errno = EINVAL;
}
return binmode;
}
@ -50,7 +60,8 @@ FILE* _fopen (const char* name, const char* mode, FILE* f)
/* Convert ASCII mode to binary mode */
if ((binmode = amode_to_bmode (mode)) == 0) {
/* Invalid mode, _errno already set */
/* Invalid mode */
_errno = EINVAL;
return 0;
}