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

1.1     ! root        1: /*
        !             2:  * libc/gen/mktemp.c
        !             3:  * Produce a unique filename by replacing
        !             4:  * the trailing 6 X's on the user's input string
        !             5:  * with process id and a unique letter.
        !             6:  * (It is assumed, but not checked, that the X's are present.)
        !             7:  * Revised by Michael Griffin, 7-5-84; by steve, 1/5/93.
        !             8:  * Avoids unsuitable characters in generator.
        !             9:  * Repeats after 26+26+10+1=63 invocations by the same process.
        !            10:  */
        !            11: 
        !            12: char *
        !            13: mktemp(template) char *template;
        !            14: {
        !            15:        static char generator = 'a';
        !            16:        register char *p;
        !            17:        register int i, pid;
        !            18: 
        !            19: 
        !            20:        for (p = template; *p; p++)
        !            21:                ;                               /* scan to end of template */
        !            22:        *--p = generator;                       /* store generator */
        !            23:        switch (generator)  {                   /* bump generator */
        !            24:        case 'z':       generator = 'A';                break;
        !            25:        case 'Z':       generator = '0';                break;
        !            26:        case '9':       generator = '_';                break;
        !            27:        case '_':       generator = 'a';                break;
        !            28:        default:        ++generator;                    break;
        !            29:        }
        !            30:        pid = getpid();
        !            31:        for (i = 5; i-- > 0; ) {                /* store 5-digit ASCII pid */
        !            32:                *--p = pid%10 + '0';
        !            33:                pid /= 10;
        !            34:        }
        !            35:        return template;
        !            36: }
        !            37: 
        !            38: /* end of libc/gen/mktemp.c */

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