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Annotation of 41BSD/cmd/ucbmail/strings.c, revision 1.1

1.1     ! root        1: #
        !             2: 
        !             3: /*
        !             4:  * Mail -- a mail program
        !             5:  *
        !             6:  * String allocation routines.
        !             7:  * Strings handed out here are reclaimed at the top of the command
        !             8:  * loop each time, so they need not be freed.
        !             9:  */
        !            10: 
        !            11: #include "rcv.h"
        !            12: 
        !            13: /*
        !            14:  * Allocate size more bytes of space and return the address of the
        !            15:  * first byte to the caller.  An even number of bytes are always
        !            16:  * allocated so that the space will always be on a word boundary.
        !            17:  * The string spaces are of exponentially increasing size, to satisfy
        !            18:  * the occasional user with enormous string size requests.
        !            19:  */
        !            20: 
        !            21: char *
        !            22: salloc(size)
        !            23: {
        !            24:        register char *t;
        !            25:        register int s;
        !            26:        register struct strings *sp;
        !            27:        int index;
        !            28: 
        !            29:        s = size;
        !            30:        s++;
        !            31:        s &= ~01;
        !            32:        index = 0;
        !            33:        for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) {
        !            34:                if (sp->s_topFree == NOSTR && (STRINGSIZE << index) >= s)
        !            35:                        break;
        !            36:                if (sp->s_nleft >= s)
        !            37:                        break;
        !            38:                index++;
        !            39:        }
        !            40:        if (sp >= &stringdope[NSPACE])
        !            41:                panic("String too large");
        !            42:        if (sp->s_topFree == NOSTR) {
        !            43:                index = sp - &stringdope[0];
        !            44:                sp->s_topFree = (char *) calloc(STRINGSIZE << index,
        !            45:                    (unsigned) 1);
        !            46:                if (sp->s_topFree == NOSTR) {
        !            47:                        fprintf(stderr, "No room for space %d\n", index);
        !            48:                        panic("Internal error");
        !            49:                }
        !            50:                sp->s_nextFree = sp->s_topFree;
        !            51:                sp->s_nleft = STRINGSIZE << index;
        !            52:        }
        !            53:        sp->s_nleft -= s;
        !            54:        t = sp->s_nextFree;
        !            55:        sp->s_nextFree += s;
        !            56:        return(t);
        !            57: }
        !            58: 
        !            59: /*
        !            60:  * Reset the string area to be empty.
        !            61:  * Called to free all strings allocated
        !            62:  * since last reset.
        !            63:  */
        !            64: 
        !            65: sreset()
        !            66: {
        !            67:        register struct strings *sp;
        !            68:        register int index;
        !            69: 
        !            70:        if (noreset)
        !            71:                return;
        !            72:        minit();
        !            73:        index = 0;
        !            74:        for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) {
        !            75:                if (sp->s_topFree == NOSTR)
        !            76:                        continue;
        !            77:                sp->s_nextFree = sp->s_topFree;
        !            78:                sp->s_nleft = STRINGSIZE << index;
        !            79:                index++;
        !            80:        }
        !            81: }

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