C Programming Language (2nd Edition) by Brian W. Kernighan & Dennis Ritchie

Author:Brian W. Kernighan & Dennis Ritchie [Kernighan, Brian W.]
Language: eng
Format: epub
Publisher: Pearson Education
Published: 1988-03-22T04:00:00+00:00

The for loop in lookup is the standard idiom for walking along a linked list:

for (ptr = head; ptr != NULL; ptr = ptr->next)

...

install uses lookup to determine whether the name being installed is already present; if so, the new definition will supersede the old one. Otherwise, a new entry is created. install returns NULL if for any reason there is no room for a new entry.

Click here to view code image struct nlist *lookup(char *);

char *strdup(char *);

/* install: put (name, defn) in hashtab */

struct nlist *install(char *name, char *defn)

{

struct nlist *np;

unsigned hashval;

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