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unzip/envargs.c

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/*
Copyright (c) 1990-2005 Info-ZIP. All rights reserved.
See the accompanying file LICENSE, version 2000-Apr-09 or later
(the contents of which are also included in unzip.h) for terms of use.
If, for some reason, all these files are missing, the Info-ZIP license
also may be found at: ftp://ftp.info-zip.org/pub/infozip/license.html
*/
/*----------------------------------------------------------------*
| envargs - add default options from environment to command line
|----------------------------------------------------------------
| Author: Bill Davidsen, original 10/13/91, revised 23 Oct 1991.
| This program is in the public domain.
|----------------------------------------------------------------
| Minor program notes:
| 1. Yes, the indirection is a tad complex
| 2. Parentheses were added where not needed in some cases
| to make the action of the code less obscure.
|----------------------------------------------------------------
| UnZip notes: 24 May 92 ("v1.4"):
| 1. #include "unzip.h" for prototypes (24 May 92)
| 2. changed ch to type char (24 May 92)
| 3. added an ifdef to avoid Borland warnings (24 May 92)
| 4. included Rich Wales' mksargs() routine (for MS-DOS, maybe
| OS/2? NT?) (4 Dec 93)
| 5. added alternate-variable string envstr2 (21 Apr 94)
| 6. added support for quoted arguments (6 Jul 96)
*----------------------------------------------------------------*/
#define __ENVARGS_C /* identifies this source module */
#define UNZIP_INTERNAL
#include "unzip.h"
#ifdef __EMX__ /* emx isspace() returns TRUE on extended ASCII !! */
# define ISspace(c) ((c) & 0x80 ? 0 : isspace((unsigned)c))
#else
# define ISspace(c) isspace((unsigned)c)
#endif /* ?__EMX__ */
#if (!defined(RISCOS) && (!defined(MODERN) || defined(NO_STDLIB_H)))
extern char *getenv();
#endif
static int count_args OF((ZCONST char *));
/* envargs() returns PK-style error code */
int envargs(Pargc, Pargv, envstr, envstr2)
int *Pargc;
char ***Pargv;
ZCONST char *envstr, *envstr2;
{
char *envptr; /* value returned by getenv */
char *bufptr; /* copy of env info */
int argc = 0; /* internal arg count */
register int ch; /* spare temp value */
char **argv; /* internal arg vector */
char **argvect; /* copy of vector address */
/* see if anything in the environment */
if ((envptr = getenv(envstr)) != (char *)NULL) /* usual var */
while (ISspace(*envptr)) /* must discard leading spaces */
envptr++;
if (envptr == (char *)NULL || *envptr == '\0')
if ((envptr = getenv(envstr2)) != (char *)NULL) /* alternate var */
while (ISspace(*envptr))
envptr++;
if (envptr == (char *)NULL || *envptr == '\0')
return PK_OK;
bufptr = malloc(1 + strlen(envptr));
if (bufptr == (char *)NULL)
return PK_MEM;
#if ((defined(WIN32) || defined(WINDLL)) && !defined(_WIN32_WCE))
# ifdef WIN32
if (IsWinNT()) {
/* SPC: don't know codepage of 'real' WinNT console */
strcpy(bufptr, envptr);
} else {
/* Win95 environment is DOS and uses OEM character coding */
OEM_TO_INTERN(envptr, bufptr);
}
# else /* !WIN32 */
/* DOS (Win 3.x) environment uses OEM codepage */
OEM_TO_INTERN(envptr, bufptr);
# endif
#else /* !((WIN32 || WINDLL) && !_WIN32_WCE) */
strcpy(bufptr, envptr);
#endif /* ?((WIN32 || WINDLL) && !_WIN32_WCE) */
/* count the args so we can allocate room for them */
argc = count_args(bufptr);
/* allocate a vector large enough for all args */
argv = (char **)malloc((argc + *Pargc + 1) * sizeof(char *));
if (argv == (char **)NULL) {
free(bufptr);
return PK_MEM;
}
argvect = argv;
/* copy the program name first, that's always true */
*(argv++) = *((*Pargv)++);
/* copy the environment args next, may be changed */
do {
#if defined(AMIGA) || defined(UNIX)
if (*bufptr == '"') {
char *argstart = ++bufptr;
*(argv++) = argstart;
for (ch = *bufptr; ch != '\0' && ch != '\"';
ch = *PREINCSTR(bufptr))
if (ch == '\\' && bufptr[1] != '\0')
++bufptr; /* advance to char after backslash */
if (ch != '\0')
*(bufptr++) = '\0'; /* overwrite trailing " */
/* remove escape characters */
while ((argstart = MBSCHR(argstart, '\\')) != (char *)NULL) {
strcpy(argstart, argstart + 1);
if (*argstart)
++argstart;
}
} else {
*(argv++) = bufptr;
while ((ch = *bufptr) != '\0' && !ISspace(ch))
INCSTR(bufptr);
if (ch != '\0')
*(bufptr++) = '\0';
}
#else
#ifdef DOS_FLX_NLM_OS2_W32
/* we do not support backslash-quoting of quotes in quoted
* strings under DOS_FLX_NLM_OS2_W32, because backslashes are
* directory separators and double quotes are illegal in filenames */
if (*bufptr == '"') {
*(argv++) = ++bufptr;
while ((ch = *bufptr) != '\0' && ch != '\"')
INCSTR(bufptr);
if (ch != '\0')
*(bufptr++) = '\0';
} else {
*(argv++) = bufptr;
while ((ch = *bufptr) != '\0' && !ISspace(ch))
INCSTR(bufptr);
if (ch != '\0')
*(bufptr++) = '\0';
}
#else
*(argv++) = bufptr;
while ((ch = *bufptr) != '\0' && !ISspace(ch))
INCSTR(bufptr);
if (ch != '\0')
*(bufptr++) = '\0';
#endif /* ?DOS_FLX_NLM_OS2_W32 */
#endif /* ?(AMIGA || UNIX) */
while ((ch = *bufptr) != '\0' && ISspace(ch))
INCSTR(bufptr);
} while (ch);
/* now save old argc and copy in the old args */
argc += *Pargc;
while (--(*Pargc))
*(argv++) = *((*Pargv)++);
/* finally, add a NULL after the last arg, like Unix */
*argv = (char *)NULL;
/* save the values and return, indicating succes */
*Pargv = argvect;
*Pargc = argc;
return PK_OK;
}
static int count_args(s)
ZCONST char *s;
{
int count = 0;
char ch;
do {
/* count and skip args */
++count;
#if defined(AMIGA) || defined(UNIX)
if (*s == '\"') {
for (ch = *PREINCSTR(s); ch != '\0' && ch != '\"';
ch = *PREINCSTR(s))
if (ch == '\\' && s[1] != '\0')
++s;
if (*s)
++s; /* trailing quote */
} else
#else
#ifdef DOS_FLX_NLM_OS2_W32
if (*s == '\"') {
++s; /* leading quote */
while ((ch = *s) != '\0' && ch != '\"')
INCSTR(s);
if (*s)
++s; /* trailing quote */
} else
#endif /* DOS_FLX_NLM_OS2_W32 */
#endif /* ?(AMIGA || UNIX) */
while ((ch = *s) != '\0' && !ISspace(ch)) /* note else-clauses above */
INCSTR(s);
while ((ch = *s) != '\0' && ISspace(ch))
INCSTR(s);
} while (ch);
return count;
}
#ifdef TEST
int main(argc, argv)
int argc;
char **argv;
{
int err;
printf("Orig argv: %p\n", argv);
dump_args(argc, argv);
if ((err = envargs(&argc, &argv, "ENVTEST")) != PK_OK) {
perror("envargs: cannot get memory for arguments");
EXIT(err);
}
printf(" New argv: %p\n", argv);
dump_args(argc, argv);
}
void dump_args(argc, argv)
int argc;
char *argv[];
{
int i;
printf("\nDump %d args:\n", argc);
for (i = 0; i < argc; ++i)
printf("%3d %s\n", i, argv[i]);
}
#endif /* TEST */
#ifdef MSDOS /* DOS_OS2? DOS_OS2_W32? */
/*
* void mksargs(int *argcp, char ***argvp)
*
* Substitutes the extended command line argument list produced by
* the MKS Korn Shell in place of the command line info from DOS.
*
* The MKS shell gets around DOS's 128-byte limit on the length of
* a command line by passing the "real" command line in the envi-
* ronment. The "real" arguments are flagged by prepending a tilde
* (~) to each one.
*
* This "mksargs" routine creates a new argument list by scanning
* the environment from the beginning, looking for strings begin-
* ning with a tilde character. The new list replaces the original
* "argv" (pointed to by "argvp"), and the number of arguments
* in the new list replaces the original "argc" (pointed to by
* "argcp").
*
* Rich Wales
*/
void mksargs(argcp, argvp)
int *argcp;
char ***argvp;
{
#ifndef MSC /* declared differently in MSC 7.0 headers, at least */
#ifndef __WATCOMC__
extern char **environ; /* environment */
#endif
#endif
char **envp; /* pointer into environment */
char **newargv; /* new argument list */
char **argp; /* pointer into new arg list */
int newargc; /* new argument count */
/* sanity check */
if (environ == NULL || argcp == NULL || argvp == NULL || *argvp == NULL)
return;
/* find out how many environment arguments there are */
for (envp = environ, newargc = 0;
*envp != NULL && (*envp)[0] == '~';
envp++, newargc++)
;
if (newargc == 0)
return; /* no environment arguments */
/* set up new argument list */
newargv = (char **) malloc(sizeof(char **) * (newargc+1));
if (newargv == NULL)
return; /* malloc failed */
for (argp = newargv, envp = environ; *envp != NULL && (*envp)[0] == '~';
*argp++ = &(*envp++)[1])
;
*argp = NULL; /* null-terminate the list */
/* substitute new argument list in place of old one */
*argcp = newargc;
*argvp = newargv;
}
#endif /* MSDOS */
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