aboutsummaryrefslogtreecommitdiffstats
path: root/rdoff/rdlib.c
blob: ed78a0052e85a0b4531607e65a7713f17523fdc0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "rdoff.h"
#include "rdlib.h"

/*
 * format of rdoff library files:
 * repeat
 *   null terminated module name (max 255 chars)
 *   RDOFF module
 * until eof
 */

/*
 * TODO
 *
 * No support exists yet for special modules. But we aren't using
 * any special modules yet. They are only defined now so that their
 * existance doesn't break older versions of the linker... presently
 * anything whose name begins with '.' is ignored.
 */

int rdl_error = 0;

char *rdl_errors[5] = {
    "no error","could not open file", "invalid file structure",
    "file contains modules of an unsupported RDOFF version",
    "module not found"
};
int rdl_verify(const char * filename)
{
    FILE    * fp = fopen(filename, "rb");
    char    buf[257];
    int     i;
    long    length;
    static char lastverified[256];
    static int lastresult = -1;

    if (lastresult != -1 && !strcmp(filename, lastverified))
	return lastresult;

    strcpy(lastverified, filename);

    if (!fp)
	return (rdl_error = lastresult = 1);
    
    while (!feof(fp))
    {
	i = 0;

	while (fread(buf + i,1,1,fp) == 1 && buf[i] && i < 257)
	    i++;
	if (feof(fp)) break;
	
	fread(buf, 6, 1, fp);
	buf[6] = 0;
	if (buf[0] == '.') {
	    /*
	     * a special module, eg a directory.
	     * Format of such a module is defined to be:
	     *   six char type identifier (which we've already read)
	     *   long count bytes content
	     *   content
	     * so we can handle it uniformaly with RDOFF2 modules...
	     * do nothing here. :-)
	     */
	}
	else if (strncmp(buf, "RDOFF", 5)) {
	    return rdl_error = lastresult = 2;
	}
	else if (buf[5] != '2') {
	    return rdl_error = lastresult = 3;
	}

	fread(&length, 4, 1, fp);
	fseek(fp, length, SEEK_CUR); /* skip over the module */
    }
    fclose(fp);
    return lastresult = 0;	     /* library in correct format */
}

int rdl_open (struct librarynode * lib, const char * name)
{
    int i = rdl_verify(name);
    if (i) return i;

    lib->fp = NULL;
    lib->name = strdup(name);
    lib->referenced = 0;
    lib->next = NULL;
    return 0;
}

void rdl_close (struct librarynode * lib)
{
    if (lib->fp)
	fclose(lib->fp);
    free(lib->name);
}

int rdl_searchlib (struct librarynode * lib,
		   const char * label, rdffile * f)
{
    char		buf[512];
    int			i, t;
    void *		hdr;
    rdfheaderrec	* r;
    long		l;

    rdl_error = 0;
    lib->referenced ++;

    if (! lib->fp)
    {
	lib->fp = fopen(lib->name,"rb");
	
	if (! lib->fp) {
	    rdl_error = 1;
	    return 0;
	}
    }
    else
	rewind(lib->fp);

    while (! feof(lib->fp) )
    {
	/* 
	 * read the module name from the file, and prepend 
	 * the library name and '.' to it.
	 */
	strcpy(buf, lib->name);

	i = strlen(lib->name);
	buf[i++] = '.'; t = i;
	while (fread(buf + i,1,1,lib->fp) == 1 && buf[i] && i < 512)
	    i++;

	buf[i] = 0;
	
	if (feof(lib->fp)) break;
	if (!strcmp(buf + t, ".dir")) 	/* skip over directory */
	{
	    fread (&l, 4, 1, lib->fp);
	    fseek (lib->fp, l, SEEK_CUR);
	    continue;
	}
	/*
	 * open the RDOFF module
	 */
	if ( rdfopenhere(f,lib->fp,&lib->referenced,buf) ) {
	    rdl_error = 16 * rdf_errno;
	    return 0;
	}
	/*
	 * read in the header, and scan for exported symbols
	 */
	hdr = malloc(f->header_len);
	rdfloadseg(f,RDOFF_HEADER,hdr);
	
	while ((r = rdfgetheaderrec(f)))
	{
	    if (r->type != 3)	/* not an export */
		continue;

	    if (! strcmp(r->e.label, label) )	/* match! */
	    {
		free(hdr);			/* reset to 'just open' */
		f->header_loc = NULL;		/* state... */
		f->header_fp = 0;
		return 1;
	    }
	}

	/* find start of next module... */
	i = f->eof_offset;
	rdfclose(f);
	fseek(lib->fp,i,SEEK_SET);
    }

    /*
     * close the file if nobody else is using it
     */
    lib->referenced --;
    if (! lib->referenced)
    {
	fclose(lib->fp);
	lib->fp = NULL;
    }
    return 0;
}

int rdl_openmodule (struct librarynode * lib, int moduleno, rdffile * f)
{
    char    buf[512];
    int     i, cmod, t;
    long    length;

    lib->referenced++;

    if (!lib->fp)
    {
	lib->fp = fopen(lib->name, "rb");
	if (!lib->fp) {
	    lib->referenced--;
	    return (rdl_error = 1);   
	}
    }
    else
	rewind(lib->fp);

    cmod = -1;
    while (!feof(lib->fp))
    {
	strcpy(buf, lib->name);
	i = strlen(buf); 
	buf[i++] = '.'; t = i;
	while (fread(buf + i,1,1,lib->fp) == 1 && buf[i] && i < 512)
	    i++;
	buf[i] = 0;
	if (feof(lib->fp)) break;

	if (buf[t] != '.') /* special module - not counted in the numbering */
	    cmod++;	   /* of RDOFF modules - must be referred to by name */

	if (cmod == moduleno) {
	    rdl_error = 16 *
		rdfopenhere(f, lib->fp, &lib->referenced, buf);
	    lib->referenced--;
	    if (!lib->referenced) {
		fclose(lib->fp);
		lib->fp = NULL;
	    }
	    return rdl_error;
	}

	fread(buf, 6, 1, lib->fp);
	buf[6] = 0;
	if (buf[t] == '.') {
	    /* do nothing */
	}
	else if (strncmp(buf, "RDOFF", 5)) {
	    if (! --lib->referenced) {
		fclose(lib->fp);
		lib->fp = NULL;
	    }
	    return rdl_error = 2;
	}
	else if (buf[5] != '2') {
	    if (! --lib->referenced) {
		fclose(lib->fp);
		lib->fp = NULL;
	    }
	    return rdl_error = 3;
	}

	fread(&length, 4, 1, lib->fp);
	fseek(lib->fp, length, SEEK_CUR); /* skip over the module */
    }
    if (! --lib->referenced) {
	fclose(lib->fp);
	lib->fp = NULL;
    }
    return rdl_error = 4;	/* module not found */
}

void rdl_perror(const char *apname, const char *filename)
{
    if (rdl_error >= 16)
	rdfperror(apname, filename);
    else
	fprintf(stderr,"%s:%s:%s\n",apname,filename,rdl_errors[rdl_error]);
}