PDF《请谨慎编码,哪怕它只是一句错误处理》

pprprev = pprNew;

// or insert the record to the next node // 6. return return(pprNew);

} PATH ppachain pprfirst pprlast ……… pprnext pprprev flags count ……… PATHRECORD pprnext pprprev PD_BEZIERS count ……… PATHRECORD pprnext pprprev flags count ……… PATHRECORD ppr next 指针真的未得到初始化吗? PPATHREC EPATHOBJ::pprFlattenRec(PATHRECORD *ppr) { // 1. create a new record if (newpathrec(&

pprNew,&

maxadd,MAXLONG) != TRUE) return (PPATHREC) NULL;

// 2. init some fields (count/flags ...) pprNew->

count = 0;

pprNew->

flags = (ppr->

flags &

~PD_BEZIERS);

// 3. init the prev-link of the new record pprNew->

pprprev = ppr->

pprprev;

if (pprNew->

pprprev == (PPATHREC) NULL) ppath->

pprfirst = pprNew;

// either insert the record to the head (pprfirst) else pprNew->

pprprev->

pprnext = pprNew;

// or insert the record to the prev node // 4. flattening ...... // 5. init the next-link of the new record pprNew->

pprnext = ppr->

pprnext;

if (pprNew->

pprnext == (PPATHREC) NULL) ppath->

pprlast = pprNew;

// either insert the record to the tail (pprlast) else pprNew->

pprnext->

pprprev = pprNew;

// or insert the record to the next node // 6. return return(pprNew);

} PATH ppachain pprfirst pprlast ……… pprnext pprprev flags count ……… PATHRECORD pprnext pprprev PD_BEZIERS count ……… PATHRECORD pprnext pprprev flags count ……… PATHRECORD ppr pprnext pprprev flags count ……… PATHRECORD next 指针真的未得到初始化吗? PPATHREC EPATHOBJ::pprFlattenRec(PATHRECORD *ppr) { // 1. create a new record if (newpathrec(&

pprNew,&

maxadd,MAXLONG) != TRUE) return (PPATHREC) NULL;

// 2. init some fields (count/flags ...) pprNew->

count = 0;

pprNew->

flags = (ppr->

flags &

~PD_BEZIERS);

// 3. init the prev-link of the new record pprNew->

pprprev = ppr->

pprprev;

if (pprNew->

pprprev == (PPATHREC) NULL) ppath->

pprfirst = pprNew;

// either insert the record to the head (pprfirst) else pprNew->

pprprev->

pprnext = pprNew;

// or insert the record to the prev node // 4. flattening ...... // 5. init the next-link of the new record pprNew->

pprnext = ppr->

pprnext;

if (pprNew->

pprnext == (PPATHREC) NULL) ppath->

pprlast = pprNew;

// either insert the record to the tail (pprlast) else pprNew->

pprnext->

pprprev = pprNew;

// or insert the record to the next node // 6. return return(pprNew);

} PATH ppachain pprfirst pprlast ……… pprnext pprprev flags count ……… PATHRECORD pprnext pprprev PD_BEZIERS count ……… PATHRECORD pprnext pprprev flags count ……… PATHRECORD ppr pprnext pprprev flags count ……… PATHRECORD next 指针真的未得到初始化吗? PPATHREC EPATHOBJ::pprFlattenRec(PATHRECORD *ppr) { // 1. create a new record if (newpathrec(&

pprNew,&

maxadd,MAXLONG) != TRUE) return (PPATHREC) NULL;

// 2. init some fields (count/flags ...) pprNew->

count = 0;

pprNew->

flags = (ppr->

flags &

~PD_BEZIERS);

// 3. init the prev-link of the new record pprNew->

pprprev = ppr->

pprprev;

if (pprNew->

pprprev == (PPATHREC) NULL) ppath->

pprfirst = pprNew;

// either insert the record to the head (pprfirst) else pprNew->

pprprev->

pprnext = pprNew;

// or insert the record to the prev node // 4. flattening ...... // 5. init the next-link of the new record pprNew->

pprnext = ppr->