utils/Install/sfxzip/envargs.c

   1 /*----------------------------------------------------------------*
   2  | envargs - add default options from environment to command line
   3  |----------------------------------------------------------------
   4  | Author: Bill Davidsen, original 10/13/91, revised 23 Oct 1991.
   5  | This program is in the public domain.
   6  |----------------------------------------------------------------
   7  | Minor program notes:
   8  |  1. Yes, the indirection is a tad complex
   9  |  2. Parentheses were added where not needed in some cases
  10  |     to make the action of the code less obscure.
  11  |----------------------------------------------------------------
  12  | UnZip notes: 24 May 92 ("v1.4"):
  13  |  1. #include "unzip.h" for prototypes (24 May 92)
  14  |  2. changed ch to type char (24 May 92)
  15  |  3. added an ifdef to avoid Borland warnings (24 May 92)
  16  |  4. included Rich Wales' mksargs() routine (for MS-DOS, maybe
  17  |     OS/2? NT?) (4 Dec 93)
  18  |  5. added alternate-variable string envstr2 (21 Apr 94)
  19  |  6. added support for quoted arguments (6 Jul 96)
  20  *----------------------------------------------------------------*/
  21
  22
  23 #define ENVARGS_C
  24 #define UNZIP_INTERNAL
  25 #include "unzip.h"
  26
  27 #ifdef __EMX__          /* emx isspace() returns TRUE on extended ASCII !! */
  28 #  define ISspace(c) ((c) & 0x80 ? 0 : isspace((unsigned)c))
  29 #else
  30 #  define ISspace(c) isspace((unsigned)c)
  31 #endif /* ?__EMX__ */
  32
  33 static int count_args OF((ZCONST char *));
  34 static void mem_err OF((__GPRO));
  35
  36 static ZCONST char Far NoMemArguments[] =
  37   "envargs:  cannot get memory for arguments";
  38
  39
  40 void envargs(__G__ Pargc, Pargv, envstr, envstr2)
  41     __GDEF
  42     int *Pargc;
  43     char ***Pargv;
  44     ZCONST char *envstr, *envstr2;
  45 {
  46 #ifndef RISCOS
  47     char *getenv();
  48 #endif
  49     char *envptr;       /* value returned by getenv */
  50     char *bufptr;       /* copy of env info */
  51     int argc = 0;       /* internal arg count */
  52     register int ch;    /* spare temp value */
  53     char **argv;        /* internal arg vector */
  54     char **argvect;     /* copy of vector address */
  55
  56     /* see if anything in the environment */
  57     if ((envptr = getenv(envstr)) != (char *)NULL)        /* usual var */
  58         while (ISspace(*envptr))        /* must discard leading spaces */
  59             envptr++;
  60     if (envptr == (char *)NULL || *envptr == '\0')
  61         if ((envptr = getenv(envstr2)) != (char *)NULL)   /* alternate var */
  62             while (ISspace(*envptr))
  63                 envptr++;
  64     if (envptr == (char *)NULL || *envptr == '\0')
  65         return;
  66
  67     bufptr = malloc(1 + strlen(envptr));
  68     if (bufptr == (char *)NULL)
  69         mem_err(__G);
  70 #if (defined(WIN32) || defined(WINDLL))
  71 # ifdef WIN32
  72     if (IsWinNT()) {
  73         /* SPC: don't know codepage of 'real' WinNT console */
  74         strcpy(bufptr, envptr);
  75     } else {
  76         /* Win95 environment is DOS and uses OEM character coding */
  77         OEM_TO_INTERN(envptr, bufptr);
  78     }
  79 # else /* !WIN32 */
  80     /* DOS environment uses OEM codepage */
  81     OEM_TO_INTERN(envptr, bufptr);
  82 # endif
  83 #else /* !(WIN32 || WINDLL) */
  84     strcpy(bufptr, envptr);
  85 #endif /* ?(WIN32 || WINDLL) */
  86
  87     /* count the args so we can allocate room for them */
  88     argc = count_args(bufptr);
  89     /* allocate a vector large enough for all args */
  90     argv = (char **)malloc((argc + *Pargc + 1) * sizeof(char *));
  91     if (argv == (char **)NULL) {
  92         free(bufptr);
  93         mem_err(__G);
  94     }
  95     argvect = argv;
  96
  97     /* copy the program name first, that's always true */
  98     *(argv++) = *((*Pargv)++);
  99
 100     /* copy the environment args next, may be changed */
 101     do {
 102 #if defined(AMIGA) || defined(UNIX)
 103         if (*bufptr == '"') {
 104             char *argstart = ++bufptr;
 105
 106             *(argv++) = argstart;
 107             for (ch = *bufptr; ch != '\0' && ch != '\"'; ch = *(++bufptr))
 108                 if (ch == '\\' && bufptr[1] != '\0')
 109                     ++bufptr;           /* skip char after backslash */
 110             if (ch != '\0')
 111                 *(bufptr++) = '\0';     /* overwrite trailing " */
 112
 113             /* remove escape characters */
 114             while ((argstart = strchr(argstart, '\\')) != (char *)NULL) {
 115                 strcpy(argstart, argstart + 1);
 116                 if (*argstart)
 117                     ++argstart;
 118             }
 119         } else {
 120             *(argv++) = bufptr;
 121             while ((ch = *bufptr) != '\0' && !ISspace(ch))
 122                 ++bufptr;
 123             if (ch != '\0')
 124                 *(bufptr++) = '\0';
 125         }
 126 #else
 127 #ifdef DOS_FLX_OS2_W32
 128         /* we do not support backslash-quoting of quotes in quoted
 129          * strings under DOS_OS2_W32, because backslashes are directory
 130          * separators and double quotes are illegal in filenames */
 131         if (*bufptr == '"') {
 132             *(argv++) = ++bufptr;
 133             while ((ch = *bufptr) != '\0' && ch != '\"')
 134                 ++bufptr;
 135             if (ch != '\0')
 136                 *(bufptr++) = '\0';
 137         } else {
 138             *(argv++) = bufptr;
 139             while ((ch = *bufptr) != '\0' && !ISspace(ch))
 140                 ++bufptr;
 141             if (ch != '\0')
 142                 *(bufptr++) = '\0';
 143         }
 144 #else
 145         *(argv++) = bufptr;
 146         while ((ch = *bufptr) != '\0' && !ISspace(ch))
 147             ++bufptr;
 148         if (ch != '\0')
 149             *(bufptr++) = '\0';
 150 #endif /* ?DOS_FLX_OS2_W32 */
 151 #endif /* ?(AMIGA || UNIX) */
 152         while ((ch = *bufptr) != '\0' && ISspace(ch))
 153             ++bufptr;
 154     } while (ch);
 155
 156     /* now save old argc and copy in the old args */
 157     argc += *Pargc;
 158     while (--(*Pargc))
 159         *(argv++) = *((*Pargv)++);
 160
 161     /* finally, add a NULL after the last arg, like Unix */
 162     *argv = (char *)NULL;
 163
 164     /* save the values and return */
 165     *Pargv = argvect;
 166     *Pargc = argc;
 167 }
 168
 169
 170
 171 static int count_args(s)
 172     ZCONST char *s;
 173 {
 174     int count = 0;
 175     char ch;
 176
 177     do {
 178         /* count and skip args */
 179         ++count;
 180 #if defined(AMIGA) || defined(UNIX)
 181         if (*s == '\"') {
 182             for (ch = *(++s);  ch != '\0' && ch != '\"';  ch = *(++s))
 183                 if (ch == '\\' && s[1] != '\0')
 184                     ++s;
 185             if (*s)
 186                 ++s;        /* trailing quote */
 187         } else
 188 #else
 189 #ifdef DOS_FLX_OS2_W32
 190         if (*s == '\"') {
 191             ++s;                /* leading quote */
 192             while ((ch = *s) != '\0' && ch != '\"')
 193                 ++s;
 194             if (*s)
 195                 ++s;        /* trailing quote */
 196         } else
 197 #endif /* DOS_FLX_OS2_W32 */
 198 #endif /* ?(AMIGA || UNIX) */
 199         while ((ch = *s) != '\0' && !ISspace(ch))  /* note else-clauses above */
 200             ++s;
 201         while ((ch = *s) != '\0' && ISspace(ch))
 202             ++s;
 203     } while (ch);
 204
 205     return count;
 206 }
 207
 208
 209
 210 static void mem_err(__G)
 211     __GDEF
 212 {
 213     perror(LoadFarString(NoMemArguments));
 214     DESTROYGLOBALS()
 215     EXIT(PK_MEM);
 216 }
 217
 218
 219
 220 #ifdef TEST
 221
 222 main(argc, argv)
 223     int argc;
 224     char **argv;
 225 {
 226     int i;
 227
 228     pipeit("Orig argv: %p\n", argv);
 229     dump_args(argc, argv);
 230     envargs(__G__ &argc, &argv, "ENVTEST");
 231     pipeit(" New argv: %p\n", argv);
 232     dump_args(argc, argv);
 233 }
 234
 235
 236
 237 dump_args(argc, argv)
 238     int argc;
 239     char *argv[];
 240 {
 241     int i;
 242
 243     pipeit("\nDump %d args:\n", argc);
 244     for (i = 0; i < argc; ++i)
 245         pipeit("%3d %s\n", i, argv[i]);
 246 }
 247
 248 #endif /* TEST */
 249
 250
 251
 252 #ifdef MSDOS   /* DOS_OS2?  DOS_OS2_W32? */
 253
 254 /*
 255  * void mksargs(int *argcp, char ***argvp)
 256  *
 257  *    Substitutes the extended command line argument list produced by
 258  *    the MKS Korn Shell in place of the command line info from DOS.
 259  *
 260  *    The MKS shell gets around DOS's 128-byte limit on the length of
 261  *    a command line by passing the "real" command line in the envi-
 262  *    ronment.  The "real" arguments are flagged by prepending a tilde
 263  *    (~) to each one.
 264  *
 265  *    This "mksargs" routine creates a new argument list by scanning
 266  *    the environment from the beginning, looking for strings begin-
 267  *    ning with a tilde character.  The new list replaces the original
 268  *    "argv" (pointed to by "argvp"), and the number of arguments
 269  *    in the new list replaces the original "argc" (pointed to by
 270  *    "argcp").
 271  *
 272  *    Rich Wales
 273  */
 274 void mksargs(argcp, argvp)
 275     int *argcp;
 276     char ***argvp;
 277 {
 278 #ifndef MSC /* declared differently in MSC 7.0 headers, at least */
 279 #ifndef __WATCOMC__
 280     extern char **environ;          /* environment */
 281 #endif
 282 #endif
 283     char        **envp;             /* pointer into environment */
 284     char        **newargv;          /* new argument list */
 285     char        **argp;             /* pointer into new arg list */
 286     int         newargc;            /* new argument count */
 287
 288     /* sanity check */
 289     if (environ == NULL || argcp == NULL || argvp == NULL || *argvp == NULL)
 290         return;
 291
 292     /* find out how many environment arguments there are */
 293     for (envp = environ, newargc = 0; *envp != NULL && (*envp)[0] == '~';
 294          envp++, newargc++)
 295         ;
 296     if (newargc == 0)
 297         return;     /* no environment arguments */
 298
 299     /* set up new argument list */
 300     newargv = (char **) malloc(sizeof(char **) * (newargc+1));
 301     if (newargv == NULL)
 302         return;     /* malloc failed */
 303
 304     for (argp = newargv, envp = environ; *envp != NULL && (*envp)[0] == '~';
 305          *argp++ = &(*envp++)[1])
 306         ;
 307     *argp = NULL;   /* null-terminate the list */
 308
 309     /* substitute new argument list in place of old one */
 310     *argcp = newargc;
 311     *argvp = newargv;
 312 }
 313
 314 #endif /* MSDOS */