130 lines
1.9 KiB
C
130 lines
1.9 KiB
C
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/* Print IDentifiers occurring in C programs outside comment, strings
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and character constants.
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Flags:
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-l<num> : print identifiers of <num> or more characters
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(default <num> = 8)
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Author: Erik Baalbergen
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Date: Oct 23, 1985
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*/
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#include <stdio.h>
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extern char *ProgName;
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#ifndef DEF_LENGTH
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#define DEF_LENGTH 8
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#endif
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int maxlen = DEF_LENGTH;
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BeginOfProgram() {}
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DoOption(str)
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char *str;
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{
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switch (str[1]) {
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case 'l':
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if ((maxlen = atoi(&str[2])) <= 0) {
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fprintf(stderr, "%s: option \"-l%s\" ignored\n",
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ProgName, &str[2]);
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maxlen = DEF_LENGTH;
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}
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break;
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default:
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fprintf(stderr, "%s: bad option \"%s\"\n", ProgName, str);
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break;
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}
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}
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CheckId(id, len)
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char *id;
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{
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if (len >= maxlen) {
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InsertId(id);
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}
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}
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#define HASHSIZE 257
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struct idf {
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char *id_name;
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struct idf *id_next;
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};
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struct idf *hash_tab[HASHSIZE];
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char *Malloc(), *Salloc();
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InsertId(id)
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char *id;
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{
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int hash_val = EnHash(id);
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register struct idf *idp = hash_tab[hash_val];
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register struct idf *p = 0;
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while (idp && strcmp(idp->id_name, id)) {
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p = idp;
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idp = idp->id_next;
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}
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if (idp == 0) {
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idp = (struct idf *) Malloc(sizeof(struct idf));
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idp->id_next = 0;
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if (!p) hash_tab[hash_val] = idp;
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else p->id_next = idp;
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idp->id_name = Salloc(id);
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}
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}
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char *
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Malloc(n)
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unsigned n;
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{
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char *mem, *malloc();
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if ((mem = malloc(n)) == 0) {
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fprintf(stderr, "%s: out of memory\n", ProgName);
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exit(1);
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}
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return mem;
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}
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char *
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Salloc(str)
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char *str;
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{
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char *strcpy();
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if (str == 0)
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str = "";
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return strcpy(Malloc(strlen(str) + 1), str);
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}
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EnHash(id)
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char *id;
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{
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register unsigned hash_val = 0;
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register n = maxlen;
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while (n-- && *id)
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hash_val = 31 * hash_val + *id++;
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return hash_val % (unsigned) HASHSIZE;
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}
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EndOfProgram()
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{
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register struct idf *idp;
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register int i;
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for (i = 0; i < HASHSIZE; i++) {
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for (idp = hash_tab[i]; idp; idp = idp->id_next) {
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printf("%s\n", idp->id_name);
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}
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}
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}
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