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wxWidgets/utils/Install/sfxzip/envargs.c
Bryan Petty f6bcfd974e merged 2.2 branch 
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@7748 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2000-07-15 19:51:35 +00:00

315 lines
9.2 KiB
C
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/*----------------------------------------------------------------*
| 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
#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__ */
static int count_args OF((ZCONST char *));
static void mem_err OF((__GPRO));
static ZCONST char Far NoMemArguments[] =
"envargs: cannot get memory for arguments";
void envargs(__G__ Pargc, Pargv, envstr, envstr2)
__GDEF
int *Pargc;
char ***Pargv;
ZCONST char *envstr, *envstr2;
{
#ifndef RISCOS
char *getenv();
#endif
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;
bufptr = malloc(1 + strlen(envptr));
if (bufptr == (char *)NULL)
mem_err(__G);
#if (defined(WIN32) || defined(WINDLL))
# 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 environment uses OEM codepage */
OEM_TO_INTERN(envptr, bufptr);
# endif
#else /* !(WIN32 || WINDLL) */
strcpy(bufptr, envptr);
#endif /* ?(WIN32 || WINDLL) */
/* 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);
mem_err(__G);
}
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 = *(++bufptr))
if (ch == '\\' && bufptr[1] != '\0')
++bufptr; /* skip char after backslash */
if (ch != '\0')
*(bufptr++) = '\0'; /* overwrite trailing " */
/* remove escape characters */
while ((argstart = strchr(argstart, '\\')) != (char *)NULL) {
strcpy(argstart, argstart + 1);
if (*argstart)
++argstart;
}
} else {
*(argv++) = bufptr;
while ((ch = *bufptr) != '\0' && !ISspace(ch))
++bufptr;
if (ch != '\0')
*(bufptr++) = '\0';
}
#else
#ifdef DOS_FLX_OS2_W32
/* we do not support backslash-quoting of quotes in quoted
* strings under DOS_OS2_W32, because backslashes are directory
* separators and double quotes are illegal in filenames */
if (*bufptr == '"') {
*(argv++) = ++bufptr;
while ((ch = *bufptr) != '\0' && ch != '\"')
++bufptr;
if (ch != '\0')
*(bufptr++) = '\0';
} else {
*(argv++) = bufptr;
while ((ch = *bufptr) != '\0' && !ISspace(ch))
++bufptr;
if (ch != '\0')
*(bufptr++) = '\0';
}
#else
*(argv++) = bufptr;
while ((ch = *bufptr) != '\0' && !ISspace(ch))
++bufptr;
if (ch != '\0')
*(bufptr++) = '\0';
#endif /* ?DOS_FLX_OS2_W32 */
#endif /* ?(AMIGA || UNIX) */
while ((ch = *bufptr) != '\0' && ISspace(ch))
++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 */
*Pargv = argvect;
*Pargc = argc;
}
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 = *(++s); ch != '\0' && ch != '\"'; ch = *(++s))
if (ch == '\\' && s[1] != '\0')
++s;
if (*s)
++s; /* trailing quote */
} else
#else
#ifdef DOS_FLX_OS2_W32
if (*s == '\"') {
++s; /* leading quote */
while ((ch = *s) != '\0' && ch != '\"')
++s;
if (*s)
++s; /* trailing quote */
} else
#endif /* DOS_FLX_OS2_W32 */
#endif /* ?(AMIGA || UNIX) */
while ((ch = *s) != '\0' && !ISspace(ch)) /* note else-clauses above */
++s;
while ((ch = *s) != '\0' && ISspace(ch))
++s;
} while (ch);
return count;
}
static void mem_err(__G)
__GDEF
{
perror(LoadFarString(NoMemArguments));
DESTROYGLOBALS()
EXIT(PK_MEM);
}
#ifdef TEST
main(argc, argv)
int argc;
char **argv;
{
int i;
pipeit("Orig argv: %p\n", argv);
dump_args(argc, argv);
envargs(__G__ &argc, &argv, "ENVTEST");
pipeit(" New argv: %p\n", argv);
dump_args(argc, argv);
}
dump_args(argc, argv)
int argc;
char *argv[];
{
int i;
pipeit("\nDump %d args:\n", argc);
for (i = 0; i < argc; ++i)
pipeit("%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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