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New magic word; and check it.

This commit is contained in:
Guido van Rossum 1991-12-16 13:06:34 +00:00
parent 75f8968ee7
commit 3ddee714d1
1 changed files with 8 additions and 3 deletions
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11
Python/import.c
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@ -37,6 +37,10 @@ OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#include "compile.h"
#include "ceval.h"
/* Magic word to reject pre-0.9.4 .pyc files */
#define MAGIC 0x949494L
/* Define pathname separator used in file names */
#ifdef macintosh
@ -160,9 +164,10 @@ get_module(m, name, m_ret)
fpc = fopen(namebuf, "rb");
if (fpc != NULL) {
long pyc_mtime;
(void) rd_long(fpc); /* Reserved for magic word */
long magic;
magic = rd_long(fpc);
pyc_mtime = rd_long(fpc);
if (pyc_mtime != 0 && pyc_mtime != -1 && pyc_mtime == mtime) {
if (magic == MAGIC && pyc_mtime == mtime && mtime != 0 && mtime != -1) {
v = rd_object(fpc);
if (v == NULL || err_occurred() || !is_codeobject(v)) {
err_clear();
@ -202,7 +207,7 @@ get_module(m, name, m_ret)
namebuf[namelen+1] = '\0';
fpc = fopen(namebuf, "wb");
if (fpc != NULL) {
wr_long(0L, fpc); /* Reserved for magic word */
wr_long(MAGIC, fpc);
/* First write a 0 for mtime */
wr_long(0L, fpc);
wr_object((object *)co, fpc);