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1999-01-11 Miguel de Icaza <miguel@nuclecu.unam.mx>

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* util.c: Provide workarounds for Linux kernel bug.
This commit is contained in:
Miguel de Icaza 1999-01-12 02:24:52 +00:00
parent 080ce2ef7d
commit 7bae04e59d
2 changed files with 18 additions and 16 deletions
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4
src/ChangeLog
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@ -1,3 +1,7 @@
1999-01-11 Miguel de Icaza <miguel@nuclecu.unam.mx>
* util.c: Provide workarounds for Linux kernel bug.
Sun Jan 10 02:18:33 1999 Timur Bakeyev <mc@bat.ru>
* screen.c(string_file_size): Fixed (incorrect?) printing of device num-

30
src/util.c
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@ -868,31 +868,30 @@ char *get_current_wd (char *buffer, int size)
static long
get_small_endian_long (int fd)
{
unsigned char a, b, c, d;
unsigned char buffer [4];
/* It needs to be read one byte at the time to avoid endianess
portability problems */
CHECK (mc_read (fd, &a, 1));
CHECK (mc_read (fd, &b, 1));
CHECK (mc_read (fd, &c, 1));
CHECK (mc_read (fd, &d, 1));
return (d << 24) | (c << 16) | (b << 8) | a;
CHECK (mc_read (fd, buffer, 4));
return (buffer [3] << 24) | (buffer [2] << 16) | (buffer [1] << 8) | buffer [0];
}
/*
* This constant makes the magic array on the stack be larger than
* it needs because Linux when reading the second byte of /proc/locks
* for example will write 2 bytes, even if we only asked for one
*/
#define LINUX_HAS_PROBLEMS_WHEN_READING_PROC_LOCKS_ON_SOME_KERNELS 40
/* This function returns 0 if the file is not in gunzip format */
/* or how much memory must be allocated to load the gziped file */
/* Warning: this function moves the current file pointer */
long int is_gunzipable (int fd, int *type)
{
unsigned char magic [4];
unsigned char magic [4+LINUX_HAS_PROBLEMS_WHEN_READING_PROC_LOCKS_ON_SOME_KERNELS];
*type = ISGUNZIPABLE_GUNZIP;
/* Read the magic signature */
CHECK (mc_read (fd, &magic [0], 1));
CHECK (mc_read (fd, &magic [1], 1));
CHECK (mc_read (fd, &magic [2], 1));
CHECK (mc_read (fd, &magic [3], 1));
CHECK (mc_read (fd, &magic [0], 4));
/* GZIP_MAGIC and OLD_GZIP_MAGIC */
if (magic [0] == 037 && (magic [1] == 0213 || magic [1] == 0236)){
@ -905,8 +904,7 @@ long int is_gunzipable (int fd, int *type)
if (magic [0] == 0120 && magic [1] == 0113 && magic [2] == 003 && magic [3] == 004){
/* Read compression type */
mc_lseek (fd, 8, SEEK_SET);
CHECK (mc_read (fd, &magic [0], 1));
CHECK (mc_read (fd, &magic [1], 1));
CHECK (mc_read (fd, &magic [0], 2));
/* Gzip can handle only deflated (8) or stored (0) files */
if ((magic [0] != 8 && magic [0] != 0) || magic [1] != 0)