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skip the UTF-8 BOM early, then check the magic (ELF, a.out, COFF, …)

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tg
2011-04-02 10:30:11 +00:00
parent a7091123aa
commit 7d3643d7b4
3 changed files with 17 additions and 10 deletions
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19
exec.c
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@ -22,7 +22,7 @@
#include "sh.h"
__RCSID("$MirOS: src/bin/mksh/exec.c,v 1.88 2011/03/13 01:20:18 tg Exp $");
__RCSID("$MirOS: src/bin/mksh/exec.c,v 1.89 2011/04/02 10:30:10 tg Exp $");
#ifndef MKSH_DEFAULT_EXECSHELL
#define MKSH_DEFAULT_EXECSHELL "/bin/sh"
@ -847,8 +847,15 @@ scriptexec(struct op *tp, const char **ap)
/* read error -> no good */
buf[0] = '\0';
close(fd);
/* scan for newline (or CR) or NUL _before_ end of buffer */
/* skip UTF-8 Byte Order Mark, if present */
cp = (unsigned char *)buf;
if ((cp[0] == 0xEF) && (cp[1] == 0xBB) && (cp[2] == 0xBF))
cp += 3;
/* save begin of shebang for later */
fd = (char *)cp - buf; /* either 0 or (if BOM) 3 */
/* scan for newline (or CR) or NUL _before_ end of buffer */
while ((char *)cp < (buf + sizeof(buf)))
if (*cp == '\0' || *cp == '\n' || *cp == '\r') {
*cp = '\0';
@ -858,13 +865,13 @@ scriptexec(struct op *tp, const char **ap)
/* if the shebang line is longer than MAXINTERP, bail out */
if ((char *)cp >= (buf + sizeof(buf)))
goto noshebang;
/* skip UTF-8 Byte Order Mark, if present */
cp = (unsigned char *)buf;
if ((cp[0] == 0xEF) && (cp[1] == 0xBB) && (cp[2] == 0xBF))
cp += 3;
/* restore begin of shebang position (buf+0 or buf+3) */
cp = (unsigned char *)(buf + fd);
/* bail out if read error (above) or no shebang */
if ((cp[0] != '#') || (cp[1] != '!'))
goto noshebang;
cp += 2;
/* skip whitespace before shell name */
while (*cp == ' ' || *cp == '\t')