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/*
* This file contains routines for setting up characters sources from
* files. It contains code to handle the search for include files.
*/
#include "../preproc/preproc.h"
#include "../preproc/pproto.h"
#define IsRelPath(fname) (fname[0] != '/')
static void file_src (char *fname, FILE *f);
static char **incl_search; /* standard locations to search for header files */
/*
* file_src - set up the structures for a characters source from a file,
* putting the source on the top of the stack.
*/
static void file_src(fname, f)
char *fname;
FILE *f;
{
union src_ref ref;
ref.cs = new_cs(fname, f, CBufSize);
push_src(CharSrc, &ref);
next_char = NULL;
fill_cbuf();
}
/*
* source - Open the file named fname or use stdin if fname is "-". fname
* is the first file from which to read input (that is, the outermost file).
*/
void source(fname)
char *fname;
{
FILE *f;
if (strcmp(fname, "-") == 0)
file_src("<stdin>", stdin);
else {
if ((f = fopen(fname, "r")) == NULL)
err2("cannot open ", fname);
file_src(fname, f);
}
}
/*
* include - open the file named fname and make it the current input file.
*/
void include(trigger, fname, system)
struct token *trigger;
char *fname;
int system;
{
struct str_buf *sbuf;
char *s;
char *path;
char *end_prfx;
struct src *sp;
struct char_src *cs;
char **prefix;
FILE *f;
/*
* See if this is an absolute path name.
*/
if (IsRelPath(fname)) {
sbuf = get_sbuf();
f = NULL;
if (!system) {
/*
* This is not a system include file, so search the locations
* of the "ancestor files".
*/
sp = src_stack;
while (f == NULL && sp != NULL) {
if (sp->flag == CharSrc) {
cs = sp->u.cs;
if (cs->f != NULL) {
/*
* This character source is a file.
*/
end_prfx = NULL;
for (s = cs->fname; *s != '\0'; ++s)
if (*s == '/')
end_prfx = s;
if (end_prfx != NULL)
for (s = cs->fname; s <= end_prfx; ++s)
AppChar(*sbuf, *s);
for (s = fname; *s != '\0'; ++s)
AppChar(*sbuf, *s);
path = str_install(sbuf);
f = fopen(path, "r");
}
}
sp = sp->next;
}
}
/*
* Search in the locations for the system include files.
*/
prefix = incl_search;
while (f == NULL && *prefix != NULL) {
for (s = *prefix; *s != '\0'; ++s)
AppChar(*sbuf, *s);
if (s > *prefix && s[-1] != '/')
AppChar(*sbuf, '/');
for (s = fname; *s != '\0'; ++s)
AppChar(*sbuf, *s);
path = str_install(sbuf);
f = fopen(path, "r");
++prefix;
}
rel_sbuf(sbuf);
}
else { /* The path is absolute. */
path = fname;
f = fopen(path, "r");
}
if (f == NULL)
errt2(trigger, "cannot open include file ", fname);
file_src(path, f);
}
/*
* init_files - Initialize this module, setting up the search path for
* system header files.
*/
void init_files(opt_lst, opt_args)
char *opt_lst;
char **opt_args;
{
int n_paths = 0;
int i, j;
char *s, *s1;
/*
* Determine the number of standard locations to search for
* header files and provide any declarations needed for the code
* that establishes these search locations.
*/
static char *sysdir = "/usr/include/";
n_paths = 1;
/*
* Count the number of -I options to the preprocessor.
*/
for (i = 0; opt_lst[i] != '\0'; ++i)
if (opt_lst[i] == 'I')
++n_paths;
/*
* Set up the array of standard locations to search for header files.
*/
incl_search = alloc((n_paths + 1) * sizeof(char *));
j = 0;
/*
* Get the locations from the -I options to the preprocessor.
*/
for (i = 0; opt_lst[i] != '\0'; ++i)
if (opt_lst[i] == 'I') {
s = opt_args[i];
s1 = alloc(strlen(s) + 1);
strcpy(s1, s);
incl_search[j++] = s1;
}
/*
* Establish the standard locations to search after the -I options
* on the preprocessor.
*/
incl_search[n_paths - 1] = sysdir;
incl_search[n_paths] = NULL;
}
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