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Annotation of 41BSD/cmd/awk/parse.c, revision 1.1

1.1     ! root        1: #include "awk.def"
        !             2: #include "awk.h"
        !             3: #include "stdio.h"
        !             4: node *ALLOC(n)
        !             5: {
        !             6:        register node *x;
        !             7:        x = (node *) malloc(sizeof(node) + (n-1)*sizeof(node *));
        !             8:        if (x == NULL)
        !             9:                error(FATAL, "out of space in ALLOC");
        !            10:        return(x);
        !            11: }
        !            12: node *exptostat(a) node *a;
        !            13: {
        !            14:        a->ntype = NSTAT;
        !            15:        return(a);
        !            16: }
        !            17: node   *nullstat;
        !            18: node *node0(a)
        !            19: {
        !            20:        register node *x;
        !            21:        x=ALLOC(0);
        !            22:        x->nnext = NULL;
        !            23:        x->nobj=a;
        !            24:        return(x);
        !            25: }
        !            26: node *node1(a,b) node *b;
        !            27: {
        !            28:        register node *x;
        !            29:        x=ALLOC(1);
        !            30:        x->nnext = NULL;
        !            31:        x->nobj=a;
        !            32:        x->narg[0]=b;
        !            33:        return(x);
        !            34: }
        !            35: node *node2(a,b,c) node *b, *c;
        !            36: {
        !            37:        register node *x;
        !            38:        x = ALLOC(2);
        !            39:        x->nnext = NULL;
        !            40:        x->nobj = a;
        !            41:        x->narg[0] = b;
        !            42:        x->narg[1] = c;
        !            43:        return(x);
        !            44: }
        !            45: node *node3(a,b,c,d) node *b, *c, *d;
        !            46: {
        !            47:        register node *x;
        !            48:        x = ALLOC(3);
        !            49:        x->nnext = NULL;
        !            50:        x->nobj = a;
        !            51:        x->narg[0] = b;
        !            52:        x->narg[1] = c;
        !            53:        x->narg[2] = d;
        !            54:        return(x);
        !            55: }
        !            56: node *node4(a,b,c,d,e) node *b, *c, *d, *e;
        !            57: {
        !            58:        register node *x;
        !            59:        x = ALLOC(4);
        !            60:        x->nnext = NULL;
        !            61:        x->nobj = a;
        !            62:        x->narg[0] = b;
        !            63:        x->narg[1] = c;
        !            64:        x->narg[2] = d;
        !            65:        x->narg[3] = e;
        !            66:        return(x);
        !            67: }
        !            68: node *stat3(a,b,c,d) node *b, *c, *d;
        !            69: {
        !            70:        register node *x;
        !            71:        x = node3(a,b,c,d);
        !            72:        x->ntype = NSTAT;
        !            73:        return(x);
        !            74: }
        !            75: node *op2(a,b,c) node *b, *c;
        !            76: {
        !            77:        register node *x;
        !            78:        x = node2(a,b,c);
        !            79:        x->ntype = NEXPR;
        !            80:        return(x);
        !            81: }
        !            82: node *op1(a,b) node *b;
        !            83: {
        !            84:        register node *x;
        !            85:        x = node1(a,b);
        !            86:        x->ntype = NEXPR;
        !            87:        return(x);
        !            88: }
        !            89: node *stat1(a,b) node *b;
        !            90: {
        !            91:        register node *x;
        !            92:        x = node1(a,b);
        !            93:        x->ntype = NSTAT;
        !            94:        return(x);
        !            95: }
        !            96: node *op3(a,b,c,d) node *b, *c, *d;
        !            97: {
        !            98:        register node *x;
        !            99:        x = node3(a,b,c,d);
        !           100:        x->ntype = NEXPR;
        !           101:        return(x);
        !           102: }
        !           103: node *stat2(a,b,c) node *b, *c;
        !           104: {
        !           105:        register node *x;
        !           106:        x = node2(a,b,c);
        !           107:        x->ntype = NSTAT;
        !           108:        return(x);
        !           109: }
        !           110: node *stat4(a,b,c,d,e) node *b, *c, *d, *e;
        !           111: {
        !           112:        register node *x;
        !           113:        x = node4(a,b,c,d,e);
        !           114:        x->ntype = NSTAT;
        !           115:        return(x);
        !           116: }
        !           117: node *valtonode(a, b) cell *a;
        !           118: {
        !           119:        register node *x;
        !           120:        x = node0(a);
        !           121:        x->ntype = NVALUE;
        !           122:        x->subtype = b;
        !           123:        return(x);
        !           124: }
        !           125: node *pa2stat(a,b,c) node *a, *b, *c;
        !           126: {
        !           127:        register node *x;
        !           128:        x = node3(paircnt++, a, b, c);
        !           129:        x->ntype = NPA2;
        !           130:        return(x);
        !           131: }
        !           132: node *linkum(a,b) node *a, *b;
        !           133: {
        !           134:        register node *c;
        !           135:        if(a == NULL) return(b);
        !           136:        else if(b == NULL) return(a);
        !           137:        for(c=a; c->nnext != NULL; c=c->nnext);
        !           138:        c->nnext = b;
        !           139:        return(a);
        !           140: }
        !           141: node *genprint()
        !           142: {
        !           143:        register node *x;
        !           144:        x = stat2(PRINT,valtonode(lookup("$record", symtab, 0), CFLD), nullstat);
        !           145:        return(x);
        !           146: }

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