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/* Copyright (c) 1997 Regents of the University of California */ |
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|
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#endif |
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|
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/* |
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* Handle data stream to and from GL display process. |
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*/ |
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|
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#include "standard.h" |
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#include <string.h> |
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#include "gldisp.h" |
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|
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|
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#define GD_TYPELEN 1 /* a type is 1 byte in length */ |
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|
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/* argument types */ |
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#define GD_TY_END 0 /* argument list terminator */ |
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#define GD_TY_NAM 1 /* 8-byte (max.) identifier */ |
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#define GD_TY_INT 2 /* 4-byte integer */ |
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#define GD_TY_FLT 3 /* 4-byte IEEE float */ |
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#define GD_TY_DBL 4 /* 8-byte IEEE double */ |
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#define GD_TY_CLR 5 /* 4-byte RGBE color value */ |
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#define GD_TY_ARR 6 /* 5-byte array prefix */ |
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#define GD_TY_STR 7 /* nul-terminated string */ |
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#define GD_TY_ARG 8 /* 1-byte argument list prefix */ |
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#define GD_TY_ERR 9 /* 1-byte error code */ |
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|
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#define GD_NTYPES 10 /* number of argument types */ |
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|
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/* argument lengths */ |
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#define GD_ARGLEN {0,8,4,4,8,4,5,-1,1,1} |
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|
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#define GD_MAXID 8 /* maximum id. length (must be 8) */ |
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|
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/* |
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* A request consists of an argument list, the first of |
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* which is always the request name as an 8-char (max.) string. |
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* The types of the following arguments must match the required |
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* arguments of the display request, or an error will result. |
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* |
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* Only functions return values, and they return them as a argument |
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* list on the client's receiving connection. It is up to the client |
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* program to keep track of its function calls and which values correspond |
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* to which request functions. |
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* |
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* An error is indicated with a special GD_TY_ERR code on the receiving |
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* connection, and usually indicates something fatal. |
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*/ |
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|
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/* error codes */ |
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#define GD_ER_UNRECOG 0 /* unrecognized request */ |
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#define GD_ER_ARGTYPE 1 /* argument type mismatch */ |
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#define GD_ER_ARGMISS 2 /* argument(s) missing */ |
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|
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#define GD_NERRS 3 /* number of errors */ |
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|
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/* request argument */ |
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typedef struct { |
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BYTE typ; /* argument type */ |
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BYTE atyp; /* array subtype if typ==GD_TY_ARR */ |
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union { |
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char n[GD_MAXID]; /* 8-char (max.) id. */ |
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int4 n1, n2; /* used for ID comparison */ |
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int4 i; /* 4-byte integer */ |
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float f; /* 4-byte IEEE float */ |
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double d; /* 8-byte IEEE double */ |
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COLR c; /* RGBE */ |
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struct array { |
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int4 l; /* length */ |
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MEM_PTR p; /* values */ |
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} a; /* array */ |
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char *s; /* nul-terminated string */ |
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} v; /* argument value */ |
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} GDarg; |
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|
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/* a request and its arguments */ |
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typedef struct gdreq { |
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struct gdreq *next; /* next request in list */ |
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short argc; /* number of arguments */ |
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GDarg argv[1]; /* argument list (expandable) */ |
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} GDrequest; |
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|
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GDrequest *gdProTab[GD_HSIZ]; /* registered prototypes */ |
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|
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|
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gdRegProto(r) /* register a request prototype */ |
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register GDrequest *r; |
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{ |
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register int4 hval; |
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|
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hval = gdHash(r->argv); |
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r->next = gdProTab[hval]; |
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gdProTab[hval] = r; |
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} |
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|
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|
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GDrequest * |
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gdReqAlloc(nm, ac) /* allocate a request and its arguments */ |
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char *nm; |
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int ac; |
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{ |
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register GDrequest *nr; |
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|
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if (ac < 1) |
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return(NULL); |
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nr = (GDrequest *)malloc(sizeof(GDrequest)+(ac-1)*sizeof(GDarg)); |
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if (nr == NULL) |
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return(NULL); |
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nr->next = NULL; |
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nr->argc = ac; |
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if (nm != NULL) |
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(void)strncmp(rn->argv[0].v.n, nm, GD_MAXID); |
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return(nr); |
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} |
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|
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|
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char * |
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gdStrAlloc(a, str) /* allocate and save a string value */ |
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register GDarg *a; |
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char *str; |
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{ |
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a->typ = GD_TY_STR; |
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a->v.s = (char *)malloc(strlen(str)+1); |
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if (a->v.s == NULL) |
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return(NULL); |
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return(strcpy(a->v.s, str)); |
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} |
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|
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|
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MEM_PTR |
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gdArrAlloc(a, typ, len, arr) /* allocate and assign an array */ |
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register GDarg *a; |
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int typ, len; |
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MEM_PTR arr; |
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{ |
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static short esiz[GD_NTYPES] = GD_ELELEN; |
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|
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if (esiz[typ] <= 0) |
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return(NULL); |
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a->v.a.p = (MEM_PTR)malloc(len*esiz[typ]); |
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if (a->v.a.p == NULL) |
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return(NULL); |
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a->typ = GD_TY_ARR; |
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a->atyp = typ; |
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a->v.a.l = len; |
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if (arr != NULL) |
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(void)memcpy((char *)a->v.a.p, (char *)arr, len*esiz[typ]); |
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return(a->v.a.p); |
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} |
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|
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|
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gdDoneArg(a) /* free any argument data */ |
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register GDarg *a; |
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{ |
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register int j; |
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/* free allocated arrays */ |
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switch (a->typ) { |
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case GD_TY_ARR: /* array of... */ |
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if (a->atyp == GD_TY_ARR) { /* arrays */ |
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for (j = a->v.a.l; j--; ) |
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gdDoneArg((GDarg *)a->v.a.p + j); |
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} else if (a->atyp == GD_TY_STR) { /* strings */ |
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for (j = r->v.a.l; j--; ) |
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gdFree((char **)r->v.a.p + j); |
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} |
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gdFree(r->argv[i].v.a.p); |
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break; |
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case GD_TY_STR: /* string value */ |
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gdFree(a->v.s); |
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break; |
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} |
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} |
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|
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|
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gdFreeReq(r) /* free a request */ |
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register GDrequest *r; |
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{ |
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register int i; |
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/* free any argument data */ |
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for (i = r->argc; i--; ) |
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gdDoneArg(r->argv + i); |
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gdFree(r); /* free basic structure */ |
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} |
