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Copyright (c) 1990-2002 Info-ZIP. All rights reserved.
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See the accompanying file LICENSE, version 2000-Apr-09 or later
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(the contents of which are also included in unzip.h) for terms of use.
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If, for some reason, all these files are missing, the Info-ZIP license
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also may be found at: ftp://ftp.info-zip.org/pub/infozip/license.html
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/*----------------------------------------------------------------*
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| envargs - add default options from environment to command line
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|----------------------------------------------------------------
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| Author: Bill Davidsen, original 10/13/91, revised 23 Oct 1991.
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| This program is in the public domain.
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|----------------------------------------------------------------
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| Minor program notes:
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| 1. Yes, the indirection is a tad complex
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| 2. Parentheses were added where not needed in some cases
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| to make the action of the code less obscure.
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|----------------------------------------------------------------
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| UnZip notes: 24 May 92 ("v1.4"):
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| 1. #include "unzip.h" for prototypes (24 May 92)
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| 2. changed ch to type char (24 May 92)
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| 3. added an ifdef to avoid Borland warnings (24 May 92)
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| 4. included Rich Wales' mksargs() routine (for MS-DOS, maybe
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| OS/2? NT?) (4 Dec 93)
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| 5. added alternate-variable string envstr2 (21 Apr 94)
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| 6. added support for quoted arguments (6 Jul 96)
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*----------------------------------------------------------------*/
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#define __ENVARGS_C /* identifies this source module */
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#define UNZIP_INTERNAL
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#ifdef __EMX__ /* emx isspace() returns TRUE on extended ASCII !! */
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# define ISspace(c) ((c) & 0x80 ? 0 : isspace((unsigned)c))
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# define ISspace(c) isspace((unsigned)c)
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static int count_args OF((ZCONST char *));
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/* envargs() returns PK-style error code */
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int envargs(Pargc, Pargv, envstr, envstr2)
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ZCONST char *envstr, *envstr2;
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char *envptr; /* value returned by getenv */
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char *bufptr; /* copy of env info */
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int argc = 0; /* internal arg count */
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register int ch; /* spare temp value */
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char **argv; /* internal arg vector */
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char **argvect; /* copy of vector address */
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/* see if anything in the environment */
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if ((envptr = getenv(envstr)) != (char *)NULL) /* usual var */
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while (ISspace(*envptr)) /* must discard leading spaces */
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if (envptr == (char *)NULL || *envptr == '\0')
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if ((envptr = getenv(envstr2)) != (char *)NULL) /* alternate var */
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while (ISspace(*envptr))
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if (envptr == (char *)NULL || *envptr == '\0')
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bufptr = malloc(1 + strlen(envptr));
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if (bufptr == (char *)NULL)
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#if ((defined(WIN32) || defined(WINDLL)) && !defined(_WIN32_WCE))
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/* SPC: don't know codepage of 'real' WinNT console */
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strcpy(bufptr, envptr);
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/* Win95 environment is DOS and uses OEM character coding */
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OEM_TO_INTERN(envptr, bufptr);
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/* DOS (Win 3.x) environment uses OEM codepage */
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OEM_TO_INTERN(envptr, bufptr);
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#else /* !((WIN32 || WINDLL) && !_WIN32_WCE) */
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strcpy(bufptr, envptr);
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#endif /* ?((WIN32 || WINDLL) && !_WIN32_WCE) */
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/* count the args so we can allocate room for them */
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argc = count_args(bufptr);
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/* allocate a vector large enough for all args */
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argv = (char **)malloc((argc + *Pargc + 1) * sizeof(char *));
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if (argv == (char **)NULL) {
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/* copy the program name first, that's always true */
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*(argv++) = *((*Pargv)++);
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/* copy the environment args next, may be changed */
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#if defined(AMIGA) || defined(UNIX)
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if (*bufptr == '"') {
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char *argstart = ++bufptr;
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*(argv++) = argstart;
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for (ch = *bufptr; ch != '\0' && ch != '\"';
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ch = *PREINCSTR(bufptr))
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if (ch == '\\' && bufptr[1] != '\0')
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++bufptr; /* advance to char after backslash */
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*(bufptr++) = '\0'; /* overwrite trailing " */
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/* remove escape characters */
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while ((argstart = MBSCHR(argstart, '\\')) != (char *)NULL) {
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strcpy(argstart, argstart + 1);
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while ((ch = *bufptr) != '\0' && !ISspace(ch))
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#ifdef DOS_FLX_NLM_OS2_W32
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/* we do not support backslash-quoting of quotes in quoted
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* strings under DOS_FLX_NLM_OS2_W32, because backslashes are
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* directory separators and double quotes are illegal in filenames */
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if (*bufptr == '"') {
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*(argv++) = ++bufptr;
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while ((ch = *bufptr) != '\0' && ch != '\"')
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while ((ch = *bufptr) != '\0' && !ISspace(ch))
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while ((ch = *bufptr) != '\0' && !ISspace(ch))
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#endif /* ?DOS_FLX_NLM_OS2_W32 */
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#endif /* ?(AMIGA || UNIX) */
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while ((ch = *bufptr) != '\0' && ISspace(ch))
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/* now save old argc and copy in the old args */
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*(argv++) = *((*Pargv)++);
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/* finally, add a NULL after the last arg, like Unix */
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*argv = (char *)NULL;
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/* save the values and return, indicating succes */
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static int count_args(s)
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/* count and skip args */
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#if defined(AMIGA) || defined(UNIX)
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for (ch = *PREINCSTR(s); ch != '\0' && ch != '\"';
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if (ch == '\\' && s[1] != '\0')
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++s; /* trailing quote */
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#ifdef DOS_FLX_NLM_OS2_W32
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++s; /* leading quote */
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while ((ch = *s) != '\0' && ch != '\"')
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++s; /* trailing quote */
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#endif /* DOS_FLX_NLM_OS2_W32 */
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#endif /* ?(AMIGA || UNIX) */
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while ((ch = *s) != '\0' && !ISspace(ch)) /* note else-clauses above */
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while ((ch = *s) != '\0' && ISspace(ch))
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printf("Orig argv: %p\n", argv);
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dump_args(argc, argv);
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if ((err = envargs(&argc, &argv, "ENVTEST")) != PK_OK) {
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perror("envargs: cannot get memory for arguments");
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printf(" New argv: %p\n", argv);
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dump_args(argc, argv);
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void dump_args(argc, argv)
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printf("\nDump %d args:\n", argc);
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for (i = 0; i < argc; ++i)
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printf("%3d %s\n", i, argv[i]);
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#ifdef MSDOS /* DOS_OS2? DOS_OS2_W32? */
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* void mksargs(int *argcp, char ***argvp)
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* Substitutes the extended command line argument list produced by
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* the MKS Korn Shell in place of the command line info from DOS.
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* The MKS shell gets around DOS's 128-byte limit on the length of
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* a command line by passing the "real" command line in the envi-
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* ronment. The "real" arguments are flagged by prepending a tilde
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* This "mksargs" routine creates a new argument list by scanning
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* the environment from the beginning, looking for strings begin-
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* ning with a tilde character. The new list replaces the original
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* "argv" (pointed to by "argvp"), and the number of arguments
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* in the new list replaces the original "argc" (pointed to by
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void mksargs(argcp, argvp)
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#ifndef MSC /* declared differently in MSC 7.0 headers, at least */
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extern char **environ; /* environment */
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char **envp; /* pointer into environment */
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char **newargv; /* new argument list */
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char **argp; /* pointer into new arg list */
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int newargc; /* new argument count */
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if (environ == NULL || argcp == NULL || argvp == NULL || *argvp == NULL)
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/* find out how many environment arguments there are */
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for (envp = environ, newargc = 0;
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*envp != NULL && (*envp)[0] == '~';
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return; /* no environment arguments */
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/* set up new argument list */
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newargv = (char **) malloc(sizeof(char **) * (newargc+1));
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return; /* malloc failed */
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for (argp = newargv, envp = environ; *envp != NULL && (*envp)[0] == '~';
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*argp++ = &(*envp++)[1])
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*argp = NULL; /* null-terminate the list */
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/* substitute new argument list in place of old one */
added
removed
envargs.c
