ldgetnam.c

speech signal process tools

#include <stdio.h>
#include "filehdr.h"
#include "syms.h"
#include "ldfcn.h"

/* static char *sccs_id = "@(#)ldgetnam.c	1.2 12/8/89 ESI, ATT"; */

#define SYMESZ 18

char *
ldgetname(ldptr, symentry)
	register LDFILE *ldptr;
	register SYMENT *symentry;
{
	static char buffer[BUFSIZ + SYMNMLEN];
	extern int vldldptr();
	extern char *strncpy();
#ifdef FLEXNAMES
	extern char *strcpy();
	extern char *malloc();
	extern void free();
	static char *strtab = NULL;
	static int last_fnum_ = 0;
	static long last_offset = -1L;
	static long length;
#endif

	if (vldldptr(ldptr) != SUCCESS)
		return (NULL);
#ifdef FLEXNAMES
	if (symentry->n_zeroes == 0L)	/* stored in string table */
	{
		/*
		* Different archive members are noted by the OFFSET change.
		* Otherwise, normal other ldptr's are distinguished by
		* the different _fnum_'s.
		*/
		if (last_offset != OFFSET(ldptr) ||
			last_fnum_ != ldptr->_fnum_)
		{
			long string_begin, home;

			if (strtab != NULL)
				free(strtab);
			string_begin = HEADER(ldptr).f_symptr +
				HEADER(ldptr).f_nsyms * SYMESZ;
			home = FTELL(ldptr);
			if (FSEEK(ldptr, string_begin, BEGINNING) != OKFSEEK ||
				FREAD((char *)&length, sizeof(long), 1, ldptr)
				!= 1 ||
				(strtab = malloc((unsigned)length)) == NULL ||
				FREAD(strtab + sizeof(long), sizeof(char),
				length - sizeof(long), ldptr)
				!= length - sizeof(long) ||
				fseek(IOPTR(ldptr), home, 0) != OKFSEEK ||
				strtab[length - 1] != '\0')
			{
				/*
				* Try to have no side effects if an error
				* occurs somewhere...
				*/
				(void)fseek(IOPTR(ldptr), home, 0);
				return (NULL);
			}
			last_fnum_ = ldptr->_fnum_;
			last_offset = OFFSET(ldptr);
		}
		if (length <= symentry->n_offset)
			return (NULL);
		return (strcpy(buffer, strtab + symentry->n_offset));
	}
	else	/* still in old COFF location */
#endif
	{
		(void)strncpy(buffer, symentry->n_name, SYMNMLEN);
		buffer[SYMNMLEN] = '\0';
		return (buffer);
	}
}