Return to _addargs.c CVS log

Up to [MW Coherent from dump] / coherent / b / lib / libc / gen

Annotation of coherent/b/lib/libc/gen/_addargs.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * libc/gen/_addargs.c
        !             3:  * Add environmental args to argc/argv.
        !             4:  */
        !             5: 
        !             6: #include <stdio.h>
        !             7: #include <string.h>
        !             8: #include <ctype.h>
        !             9: 
        !            10: #define        NBUF    128
        !            11: 
        !            12: /* External. */
        !            13: extern char *getenv();
        !            14: extern char *malloc();
        !            15: 
        !            16: /* Forward. */
        !            17: static char    **copyargs();
        !            18: static int     getargs();
        !            19: static char    *scanarg();
        !            20: 
        !            21: /*
        !            22:  * Add "nameHEAD" and "nameTAIL" to the supplied argc/argv.
        !            23:  * Return -1 on failure, 0 if argc/argv unchanged, 1 otherwise.
        !            24:  */
        !            25: int
        !            26: _addargs(name, argcp, argvp) char *name; int *argcp; char ***argvp;
        !            27: {
        !            28:        register char **cpp, **oargv;
        !            29:        register int oargc, hargc, targc;
        !            30:        char *hp, *tp;
        !            31:        
        !            32:        if ((hargc = getargs(name, "HEAD", &hp)) == -1)
        !            33:                return -1;
        !            34:        if ((targc = getargs(name, "TAIL", &tp)) == -1)
        !            35:                return -1;
        !            36:        if (hargc == 0 && targc == 0)
        !            37:                return 0;
        !            38:        oargc = *argcp;
        !            39:        oargv = *argvp;
        !            40:        if ((cpp = (char **)malloc((hargc + oargc + targc + 1) * sizeof(char *))) == NULL)
        !            41:                return -1;
        !            42:        *argcp = hargc + oargc + targc;
        !            43:        *argvp = cpp;
        !            44:        *cpp++ = *oargv++;                      /* old argv[0] */
        !            45:        if (hargc != 0)
        !            46:                cpp = copyargs(cpp, hp);        /* HEAD args */
        !            47:        while (*oargv != NULL)
        !            48:                *cpp++ = *oargv++;              /* remainder of old argv[] */
        !            49:        if (targc != 0)
        !            50:                cpp = copyargs(cpp, tp);        /* TAIL args */
        !            51:        *cpp = NULL;                            /* NULL-terminate */
        !            52:        return 1;
        !            53: }
        !            54: 
        !            55: /*
        !            56:  * NUL-terminate each whitespace-separated arg in p
        !            57:  * and store a pointer to each arg in cpp.
        !            58:  * Return the updated cpp.
        !            59:  */
        !            60: static
        !            61: char **
        !            62: copyargs(cpp, p) register char **cpp; register char *p;
        !            63: {
        !            64:        register char c;
        !            65: 
        !            66:        while ((c = *p) != '\0') {
        !            67:                if (isspace(c))
        !            68:                        *p++ = '\0';
        !            69:                else if (c == '\'' || c == '"') {
        !            70:                        *cpp++ = p + 1;
        !            71:                        p = scanarg(p);
        !            72:                        if (*(p-1) == c)
        !            73:                                *(p-1) = '\0';
        !            74:                } else {
        !            75:                        *cpp++ = p++;
        !            76:                        p = scanarg(p);
        !            77:                }
        !            78:        }
        !            79:        return cpp;
        !            80: }
        !            81: 
        !            82: /*
        !            83:  * Look for environmental variable "<name><ext>".
        !            84:  * If found, malloc a copy and store its address through cpp.
        !            85:  * Return -1 if malloc fails,
        !            86:  * else return count of whitespace-separated args in result.
        !            87:  */
        !            88: static
        !            89: int
        !            90: getargs(name, ext, cpp) char *name, *ext; char **cpp;
        !            91: {
        !            92:        register char *cp, *p;
        !            93:        register int count;
        !            94:        char buf[NBUF];
        !            95: 
        !            96:        if ((cp = getenv(strcat(strcpy(buf, name), ext))) == NULL)
        !            97:                return 0;
        !            98:        if ((p = malloc(strlen(cp) + 1)) == NULL)
        !            99:                return -1;
        !           100:        *cpp = strcpy(p, cp);
        !           101:        count = 0;
        !           102:        while (*p != '\0') {
        !           103:                if (!isspace(*p)) {
        !           104:                        ++count;
        !           105:                        p = scanarg(p);
        !           106:                } else
        !           107:                        ++p;
        !           108:        }
        !           109:        return count;
        !           110: }
        !           111: 
        !           112: /*
        !           113:  * Scan arg p to next whitespace or NUL.
        !           114:  * Ignore whitespace within args quoted by ' ' or " ".
        !           115:  * Return pointer to following character.
        !           116:  */
        !           117: static
        !           118: char *
        !           119: scanarg(p) register char *p;
        !           120: {
        !           121:        register char c;
        !           122: 
        !           123:        if ((c = *p) == '\'' || c == '"') {
        !           124:                ++p;
        !           125:                while (*p != '\0' && *p++ != c)
        !           126:                        ;
        !           127:        } else
        !           128:                while (!isspace(*p) && *p != '\0')
        !           129:                        ++p;
        !           130:        return p;
        !           131: }
        !           132: 
        !           133: /* end of _addargs.c */

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.