72 lines
1.8 KiB
C
72 lines
1.8 KiB
C
/*
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* "nlist.c", Peter Valkenburg, january 1989.
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*/
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#include <lib.h>
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#include <string.h>
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#include <a.out.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdio.h>
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#define fail(fp) (fclose(fp), -1) /* ret. exp. when nlist fails */
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_PROTOTYPE( int nlist, (char *file, struct nlist nl[]));
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/*
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* Nlist fills fields n_sclass and n_value of array nl with values found in
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* non-stripped executable file. Entries that are not found have their
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* n_value/n_sclass fields set to 0. Nl ends with a 0 or nul string n_name.
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* The return value is -1 on failure, else the number of entries not found.
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*/
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int nlist(file, nl)
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char *file;
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struct nlist nl[];
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{
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int nents, nsrch, nfound, i;
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struct nlist nlent;
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FILE *fp;
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struct exec hd;
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/* open executable with namelist */
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if ((fp = fopen(file, "r")) == NULL)
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return -1;
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/* get header and seek to start of namelist */
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if (fread((char *) &hd, sizeof(struct exec), 1, fp) != 1 ||
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BADMAG(hd) || fseek(fp, A_SYMPOS(hd), SEEK_SET) != 0)
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return fail(fp);
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/* determine number of entries searched for & reset fields */
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nsrch = 0;
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while (nl[nsrch].n_name != NULL && *(nl[nsrch].n_name) != '\0') {
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nl[nsrch].n_sclass = 0;
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nl[nsrch].n_value = 0;
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nl[nsrch].n_type = 0; /* for compatability */
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nsrch++;
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}
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/* loop through namelist & fill in user array */
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nfound = 0;
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for (nents = (hd.a_syms & 0xFFFF) / sizeof(struct nlist);
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nents > 0; nents--) {
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if (nsrch == nfound)
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break; /* no need to look further */
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if (fread((char *) &nlent, sizeof(struct nlist), 1, fp) != 1)
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return fail(fp);
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for (i = 0; i < nsrch; i++)
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if (nl[i].n_sclass == 0 &&
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strncmp(nl[i].n_name, nlent.n_name,
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sizeof(nlent.n_name)) == 0) {
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nl[i] = nlent;
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nfound++;
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break;
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}
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}
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(void) fclose(fp);
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return nsrch - nfound;
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}
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