/* util.c -- utility functions for gzip support
* Copyright (C) 1992-1993 Jean-loup Gailly
* This is free software; you can redistribute it and/or modify it under the
* terms of the GNU General Public License, see the file COPYING.
static char rcsid
[] = "$Id: util.c,v 0.14 1993/05/27 10:31:52 jloup Exp $";
#if defined(STDC_HEADERS) || !defined(NO_STDLIB_H)
extern ulg crc_32_tab
[]; /* crc table, defined below */
/* ===========================================================================
* Run a set of bytes through the crc shift register. If s is a NULL
* pointer, then initialize the crc shift register contents instead.
* Return the current crc in either case.
uch
*s
; /* pointer to bytes to pump through */
unsigned n
; /* number of bytes in s[] */
register ulg c
; /* temporary variable */
static ulg crc
= (ulg
)0xffffffffL
; /* shift register contents */
c
= crc_32_tab
[((int)c
^ (*s
++)) & 0xff] ^ (c
>> 8);
return c
^ 0xffffffffL
; /* (instead of ~c for 64-bit machines) */
/* ===========================================================================
* Clear input and output buffers
bytes_in
= bytes_out
= 0L;
/* ===========================================================================
* Fill the input buffer. This is called only when the buffer is empty
* and at least one byte is really needed.
/* Read as much as possible */
len
= read(ifd
, (char*)inbuf
+insize
, INBUFSIZ
-insize
);
if (len
== 0 || len
== EOF
) break;
} while (insize
< INBUFSIZ
);
/* ===========================================================================
* Write the output buffer outbuf[0..outcnt-1] and update bytes_out.
* (used for the compressed data only)
write_buf(ofd
, (char *)outbuf
, outcnt
);
bytes_out
+= (ulg
)outcnt
;
/* ===========================================================================
* Write the output window window[0..outcnt-1] and update crc and bytes_out.
* (Used for the decompressed data only.)
write_buf(ofd
, (char *)window
, outcnt
);
bytes_out
+= (ulg
)outcnt
;
/* ===========================================================================
* Does the same as write(), but also handles partial pipe writes and checks
void write_buf(fd
, buf
, cnt
)
while ((n
= write(fd
, buf
, cnt
)) != cnt
) {
if (n
== (unsigned)(-1)) {
buf
= (voidp
)((char*)buf
+n
);
/* ========================================================================
* Put string s in lower case, return s.
for (t
= s
; *t
; t
++) *t
= tolow(*t
);
/* ========================================================================
* Return the base name of a file (remove any directory prefix and
* any version suffix). For systems with file names that are not
* case sensitive, force the base name to lower case.
if ((p
= strrchr(fname
, PATH_SEP
)) != NULL
) fname
= p
+1;
if ((p
= strrchr(fname
, PATH_SEP2
)) != NULL
) fname
= p
+1;
if ((p
= strrchr(fname
, PATH_SEP3
)) != NULL
) fname
= p
+1;
if ((p
= strrchr(fname
, SUFFIX_SEP
)) != NULL
) *p
= '\0';
if (casemap('A') == 'a') strlwr(fname
);
#if defined(NO_STRING_H) && !defined(STDC_HEADERS)
/* Provide missing strspn and strcspn functions. */
int strspn
OF((const char *s
, const char *accept
));
int strcspn
OF((const char *s
, const char *reject
));
/* ========================================================================
* Return the length of the maximum initial segment
* of s which contains only characters in accept.
for (p
= s
; *p
!= '\0'; ++p
) {
for (a
= accept
; *a
!= '\0'; ++a
) {
if (*a
== '\0') return count
;
/* ========================================================================
* Return the length of the maximum inital segment of s
* which contains no characters from reject.
if (strchr(reject
, *s
++) != NULL
) return count
;
/* ========================================================================
* Add an environment variable (if any) before argv, and update argc.
* Return the expanded environment variable to be freed later, or NULL
* if no options were added to argv.
#define SEPARATOR " \t" /* separators in env variable */
char *add_envopt(argcp
, argvp
, env
)
int *argcp
; /* pointer to argc */
char ***argvp
; /* pointer to argv */
char *env
; /* name of environment variable */
char *p
; /* running pointer through env variable */
char **oargv
; /* runs through old argv array */
char **nargv
; /* runs through new argv array */
int oargc
= *argcp
; /* old argc */
int nargc
= 0; /* number of arguments in env variable */
env
= (char*)getenv(env
);
if (env
== NULL
) return NULL
;
p
= (char*)xmalloc(strlen(env
)+1);
env
= strcpy(p
, env
); /* keep env variable intact */
for (p
= env
; *p
; nargc
++ ) { /* move through env */
p
+= strspn(p
, SEPARATOR
); /* skip leading separators */
p
+= strcspn(p
, SEPARATOR
); /* find end of word */
if (*p
) *p
++ = '\0'; /* mark it */
/* Allocate the new argv array, with an extra element just in case
* the original arg list did not end with a NULL.
nargv
= (char**)calloc(*argcp
+1, sizeof(char *));
if (nargv
== NULL
) error("out of memory");
/* Copy the program name first */
if (oargc
-- < 0) error("argc<=0");
/* Then copy the environment args */
for (p
= env
; nargc
> 0; nargc
--) {
p
+= strspn(p
, SEPARATOR
); /* skip separators */
*(nargv
++) = p
; /* store start */
while (*p
++) ; /* skip over word */
/* Finally copy the old args and add a NULL (usual convention) */
while (oargc
--) *(nargv
++) = *(oargv
++);
/* ========================================================================
fprintf(stderr
, "\n%s: %s: %s\n", progname
, ifname
, m
);
char *a
, *b
; /* message strings juxtaposed in output */
WARN((stderr
, "%s: %s: warning: %s%s\n", progname
, ifname
, a
, b
));
fprintf(stderr
, "\n%s: ", progname
);
fprintf(stderr
, "%s: unexpected end of file\n", ifname
);
fprintf(stderr
, "\n%s: ", progname
);
/* ========================================================================
* Display compression ratio on stderr.
void display_ratio(num
, den
)
long ratio
; /* 1000 times the compression ratio */
ratio
= 0; /* no compression */
} else if (den
< 2147483L) { /* (2**31 -1)/1000 */
fprintf(stderr
, "%2ld.%ld%%", ratio
/ 10L, ratio
% 10L);
/* ========================================================================
* Semi-safe malloc -- never returns NULL.
voidp cp
= (voidp
)malloc (size
);
if (cp
== NULL
) error("out of memory");
/* ========================================================================
* Table of CRC-32's of all single-byte values (made by makecrc.c)
0x00000000L
, 0x77073096L
, 0xee0e612cL
, 0x990951baL
, 0x076dc419L
,
0x706af48fL
, 0xe963a535L
, 0x9e6495a3L
, 0x0edb8832L
, 0x79dcb8a4L
,
0xe0d5e91eL
, 0x97d2d988L
, 0x09b64c2bL
, 0x7eb17cbdL
, 0xe7b82d07L
,
0x90bf1d91L
, 0x1db71064L
, 0x6ab020f2L
, 0xf3b97148L
, 0x84be41deL
,
0x1adad47dL
, 0x6ddde4ebL
, 0xf4d4b551L
, 0x83d385c7L
, 0x136c9856L
,
0x646ba8c0L
, 0xfd62f97aL
, 0x8a65c9ecL
, 0x14015c4fL
, 0x63066cd9L
,
0xfa0f3d63L
, 0x8d080df5L
, 0x3b6e20c8L
, 0x4c69105eL
, 0xd56041e4L
,
0xa2677172L
, 0x3c03e4d1L
, 0x4b04d447L
, 0xd20d85fdL
, 0xa50ab56bL
,
0x35b5a8faL
, 0x42b2986cL
, 0xdbbbc9d6L
, 0xacbcf940L
, 0x32d86ce3L
,
0x45df5c75L
, 0xdcd60dcfL
, 0xabd13d59L
, 0x26d930acL
, 0x51de003aL
,
0xc8d75180L
, 0xbfd06116L
, 0x21b4f4b5L
, 0x56b3c423L
, 0xcfba9599L
,
0xb8bda50fL
, 0x2802b89eL
, 0x5f058808L
, 0xc60cd9b2L
, 0xb10be924L
,
0x2f6f7c87L
, 0x58684c11L
, 0xc1611dabL
, 0xb6662d3dL
, 0x76dc4190L
,
0x01db7106L
, 0x98d220bcL
, 0xefd5102aL
, 0x71b18589L
, 0x06b6b51fL
,
0x9fbfe4a5L
, 0xe8b8d433L
, 0x7807c9a2L
, 0x0f00f934L
, 0x9609a88eL
,
0xe10e9818L
, 0x7f6a0dbbL
, 0x086d3d2dL
, 0x91646c97L
, 0xe6635c01L
,
0x6b6b51f4L
, 0x1c6c6162L
, 0x856530d8L
, 0xf262004eL
, 0x6c0695edL
,
0x1b01a57bL
, 0x8208f4c1L
, 0xf50fc457L
, 0x65b0d9c6L
, 0x12b7e950L
,
0x8bbeb8eaL
, 0xfcb9887cL
, 0x62dd1ddfL
, 0x15da2d49L
, 0x8cd37cf3L
,
0xfbd44c65L
, 0x4db26158L
, 0x3ab551ceL
, 0xa3bc0074L
, 0xd4bb30e2L
,
0x4adfa541L
, 0x3dd895d7L
, 0xa4d1c46dL
, 0xd3d6f4fbL
, 0x4369e96aL
,
0x346ed9fcL
, 0xad678846L
, 0xda60b8d0L
, 0x44042d73L
, 0x33031de5L
,
0xaa0a4c5fL
, 0xdd0d7cc9L
, 0x5005713cL
, 0x270241aaL
, 0xbe0b1010L
,
0xc90c2086L
, 0x5768b525L
, 0x206f85b3L
, 0xb966d409L
, 0xce61e49fL
,
0x5edef90eL
, 0x29d9c998L
, 0xb0d09822L
, 0xc7d7a8b4L
, 0x59b33d17L
,
0x2eb40d81L
, 0xb7bd5c3bL
, 0xc0ba6cadL
, 0xedb88320L
, 0x9abfb3b6L
,
0x03b6e20cL
, 0x74b1d29aL
, 0xead54739L
, 0x9dd277afL
, 0x04db2615L
,
0x73dc1683L
, 0xe3630b12L
, 0x94643b84L
, 0x0d6d6a3eL
, 0x7a6a5aa8L
,
0xe40ecf0bL
, 0x9309ff9dL
, 0x0a00ae27L
, 0x7d079eb1L
, 0xf00f9344L
,
0x8708a3d2L
, 0x1e01f268L
, 0x6906c2feL
, 0xf762575dL
, 0x806567cbL
,
0x196c3671L
, 0x6e6b06e7L
, 0xfed41b76L
, 0x89d32be0L
, 0x10da7a5aL
,
0x67dd4accL
, 0xf9b9df6fL
, 0x8ebeeff9L
, 0x17b7be43L
, 0x60b08ed5L
,
0xd6d6a3e8L
, 0xa1d1937eL
, 0x38d8c2c4L
, 0x4fdff252L
, 0xd1bb67f1L
,
0xa6bc5767L
, 0x3fb506ddL
, 0x48b2364bL
, 0xd80d2bdaL
, 0xaf0a1b4cL
,
0x36034af6L
, 0x41047a60L
, 0xdf60efc3L
, 0xa867df55L
, 0x316e8eefL
,
0x4669be79L
, 0xcb61b38cL
, 0xbc66831aL
, 0x256fd2a0L
, 0x5268e236L
,
0xcc0c7795L
, 0xbb0b4703L
, 0x220216b9L
, 0x5505262fL
, 0xc5ba3bbeL
,
0xb2bd0b28L
, 0x2bb45a92L
, 0x5cb36a04L
, 0xc2d7ffa7L
, 0xb5d0cf31L
,
0x2cd99e8bL
, 0x5bdeae1dL
, 0x9b64c2b0L
, 0xec63f226L
, 0x756aa39cL
,
0x026d930aL
, 0x9c0906a9L
, 0xeb0e363fL
, 0x72076785L
, 0x05005713L
,
0x95bf4a82L
, 0xe2b87a14L
, 0x7bb12baeL
, 0x0cb61b38L
, 0x92d28e9bL
,
0xe5d5be0dL
, 0x7cdcefb7L
, 0x0bdbdf21L
, 0x86d3d2d4L
, 0xf1d4e242L
,
0x68ddb3f8L
, 0x1fda836eL
, 0x81be16cdL
, 0xf6b9265bL
, 0x6fb077e1L
,
0x18b74777L
, 0x88085ae6L
, 0xff0f6a70L
, 0x66063bcaL
, 0x11010b5cL
,
0x8f659effL
, 0xf862ae69L
, 0x616bffd3L
, 0x166ccf45L
, 0xa00ae278L
,
0xd70dd2eeL
, 0x4e048354L
, 0x3903b3c2L
, 0xa7672661L
, 0xd06016f7L
,
0x4969474dL
, 0x3e6e77dbL
, 0xaed16a4aL
, 0xd9d65adcL
, 0x40df0b66L
,
0x37d83bf0L
, 0xa9bcae53L
, 0xdebb9ec5L
, 0x47b2cf7fL
, 0x30b5ffe9L
,
0xbdbdf21cL
, 0xcabac28aL
, 0x53b39330L
, 0x24b4a3a6L
, 0xbad03605L
,
0xcdd70693L
, 0x54de5729L
, 0x23d967bfL
, 0xb3667a2eL
, 0xc4614ab8L
,
0x5d681b02L
, 0x2a6f2b94L
, 0xb40bbe37L
, 0xc30c8ea1L
, 0x5a05df1bL
,