char * dln_find_exe(const char *fname, const char *path) { return dln_find_exe_r(fname, path, fbuf, sizeof(fbuf)); }
static int dln_init(const char *prog) { char *file, fbuf[MAXPATHLEN]; int fd; struct exec hdr; struct nlist *syms; if (dln_init_p == 1) return 0; file = dln_find_exe_r(prog, NULL, fbuf, sizeof(fbuf)); if (file == NULL || (fd = open(file, O_RDONLY)) < 0) { dln_errno = errno; return -1; } if (load_header(fd, &hdr, 0) == -1) return -1; syms = load_sym(fd, &hdr, 0); if (syms == NULL) { close(fd); return -1; } sym_tbl = sym_hash(&hdr, syms); if (sym_tbl == NULL) { /* file may be start with #! */ char c = '\0'; char buf[MAXPATHLEN]; char *p; free(syms); lseek(fd, 0L, 0); if (read(fd, &c, 1) == -1) { dln_errno = errno; return -1; } if (c != '#') goto err_noexec; if (read(fd, &c, 1) == -1) { dln_errno = errno; return -1; } if (c != '!') goto err_noexec; p = buf; /* skip forwarding spaces */ while (read(fd, &c, 1) == 1) { if (c == '\n') goto err_noexec; if (c != '\t' && c != ' ') { *p++ = c; break; } } /* read in command name */ while (read(fd, p, 1) == 1) { if (*p == '\n' || *p == '\t' || *p == ' ') break; p++; if (p-buf >= MAXPATHLEN) { dln_errno = ENAMETOOLONG; return -1; } } *p = '\0'; return dln_init(buf); } dln_init_p = 1; undef_tbl = st_init_strtable(); close(fd); return 0; err_noexec: close(fd); dln_errno = DLN_ENOEXEC; return -1; }