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#ifndef lint
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static const char RCSid[] = "$Id: misc.c,v 1.5 2005/09/23 19:22:37 greg Exp $";
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#endif
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/*
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* Miscellaneous functions for meta-files
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*/
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#include "rtio.h"
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#include "meta.h"
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char coms[] = COML;
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/* char errmsg[128]; redundant to error.c in ../commmon */
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int
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comndx( /* return index for command */
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int c
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)
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{
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char *cp;
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if (!isalpha(c))
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return(-1);
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for (cp = coms; *cp; cp++)
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if(*cp == c)
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return(cp-coms);
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return(-1);
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}
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PRIMITIVE *
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pop( /* pop top off plist */
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PLIST *pl
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)
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{
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PRIMITIVE *p;
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if ((p = pl->ptop) != NULL) {
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if ((pl->ptop = p->pnext) == NULL)
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pl->pbot = NULL;
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p->pnext = NULL;
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}
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return(p);
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}
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void
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push( /* push primitive onto plist */
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PRIMITIVE *p,
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PLIST *pl
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)
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{
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if ((p->pnext = pl->ptop) == NULL)
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pl->pbot = p;
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pl->ptop = p;
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}
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void
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add( /* add primitive to plist */
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PRIMITIVE *p,
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PLIST *pl
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)
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{
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if (pl->ptop == NULL)
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pl->ptop = p;
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else
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pl->pbot->pnext = p;
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p->pnext = NULL;
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pl->pbot = p;
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}
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void
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append( /* append pl1 to the end of pl2 */
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PLIST *pl1,
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PLIST *pl2
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)
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{
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if (pl1->ptop != NULL) {
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if (pl2->ptop != NULL)
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pl2->pbot->pnext = pl1->ptop;
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else
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pl2->ptop = pl1->ptop;
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pl2->pbot = pl1->pbot;
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}
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}
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void
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fargs( /* free any arguments p has */
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PRIMITIVE *p
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)
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{
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if (p->args != NULL) {
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freestr(p->args);
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p->args = NULL;
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}
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}
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char *
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nextscan( /* scan and advance through string */
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char *start,
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char *format,
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char *result
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)
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{
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if (start == NULL) return(NULL);
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while (isspace(*start)) start++;
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if (sscanf(start, format, result) != 1) return(NULL);
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while (*start && !isspace(*start)) start++;
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return(start);
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}
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void
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mcopy( /* copy p2 into p1 size n */
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char *p1,
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char *p2,
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int n
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)
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{
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while (n--)
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*p1++ = *p2++;
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}
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