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
|
/*
* This file contains pathfind(), fparse(), makename(), and smatch().
*/
#include "../h/gsupport.h"
static char *pathelem (char *s, char *buf);
static char *tryfile (char *buf, char *dir, char *name, char *extn);
/*
* Define symbols for building file names.
* 1. Prefix: the characters that terminate a file name prefix
* 2. FileSep: the char to insert after a dir name, if any
* 3. DefPath: the default IPATH/LPATH
* 4. PathSep: allowable IPATH/LPATH separators
*
* All platforms use POSIX forms of file paths.
* MS Windows implementations canonize local forms before parsing.
*/
#define Prefix "/"
#define FileSep '/'
#define PathSep " :"
#define DefPath ""
/*
* pathfind(buf,path,name,extn) -- find file in path and return name.
*
* pathfind looks for a file on a path, begining with the current
* directory. Details vary by platform, but the general idea is
* that the file must be a readable simple text file. pathfind
* returns buf if it finds a file or NULL if not.
*
* buf[MaxPath] is a buffer in which to put the constructed file name.
* path is the IPATH or LPATH value, or NULL if unset.
* name is the file name.
* extn is the file extension (.icn or .u1) to be appended, or NULL if none.
*/
char *pathfind(buf, path, name, extn)
char *buf, *path, *name, *extn;
{
char *s;
char pbuf[MaxPath];
if (tryfile(buf, (char *)NULL, name, extn)) /* try curr directory first */
return buf;
if (!path) /* if no path, use default */
path = DefPath;
#if CYGWIN
s = alloca(cygwin_win32_to_posix_path_list_buf_size(path));
cygwin_win32_to_posix_path_list(path, s);
#else /* CYGWIN */
s = path;
#endif /* CYGWIN */
while ((s = pathelem(s, pbuf)) != 0) /* for each path element */
if (tryfile(buf, pbuf, name, extn)) /* look for file */
return buf;
return NULL; /* return NULL if no file found */
}
/*
* pathelem(s,buf) -- copy next path element from s to buf.
*
* Returns the updated pointer s.
*/
static char *pathelem(s, buf)
char *s, *buf;
{
char c;
while ((c = *s) != '\0' && strchr(PathSep, c))
s++;
if (!*s)
return NULL;
while ((c = *s) != '\0' && !strchr(PathSep, c)) {
*buf++ = c;
s++;
}
#ifdef FileSep
/*
* We have to append a path separator here.
* Seems like makename should really be the one to do that.
*/
if (!strchr(Prefix, buf[-1])) { /* if separator not already there */
*buf++ = FileSep;
}
#endif /* FileSep */
*buf = '\0';
return s;
}
/*
* tryfile(buf, dir, name, extn) -- check to see if file is readable.
*
* The file name is constructed in buf from dir + name + extn.
* findfile returns buf if successful or NULL if not.
*/
static char *tryfile(buf, dir, name, extn)
char *buf, *dir, *name, *extn;
{
FILE *f;
makename(buf, dir, name, extn);
if ((f = fopen(buf, "r")) != NULL) {
fclose(f);
return buf;
}
else
return NULL;
}
/*
* fparse - break a file name down into component parts.
* Result is a pointer to a struct of static pointers good until the next call.
*/
struct fileparts *fparse(s)
char *s;
{
static char buf[MaxPath+2];
static struct fileparts fp;
int n;
char *p, *q;
#if CYGWIN
char posix_s[_POSIX_PATH_MAX + 1];
cygwin_conv_to_posix_path(s, posix_s);
s = posix_s;
#endif /* CYGWIN */
q = s;
fp.ext = p = s + strlen(s);
while (--p >= s) {
if (*p == '.' && *fp.ext == '\0')
fp.ext = p;
else if (strchr(Prefix,*p)) {
q = p+1;
break;
}
}
fp.dir = buf;
n = q - s;
strncpy(fp.dir,s,n);
fp.dir[n] = '\0';
fp.name = buf + n + 1;
n = fp.ext - q;
strncpy(fp.name,q,n);
fp.name[n] = '\0';
p = fp.ext;
fp.ext = fp.name + n + 1;
strcpy(fp.ext, p);
return &fp;
}
/*
* makename - make a file name, optionally substituting a new dir and/or ext
*/
char *makename(dest,d,name,e)
char *dest, *d, *name, *e;
{
struct fileparts fp;
fp = *fparse(name);
if (d != NULL)
fp.dir = d;
if (e != NULL)
fp.ext = e;
sprintf(dest,"%s%s%s",fp.dir,fp.name,fp.ext);
return dest;
}
/*
* smatch - case-insensitive string match - returns nonzero if they match
*/
int smatch(s,t)
char *s, *t;
{
char a, b;
for (;;) {
while (*s == *t)
if (*s++ == '\0')
return 1;
else
t++;
a = *s++;
b = *t++;
if (isupper(a)) a = tolower(a);
if (isupper(b)) b = tolower(b);
if (a != b)
return 0;
}
}
#if MSWIN
FILE *pathOpen(fname, mode)
char *fname;
char *mode;
{
char buf[MaxPath];
int i;
for (i = 0; fname[i] != '\0'; i++) {
if (fname[i] == '/' || fname[i] == ':' || fname[i] == '\\') {
/* fname contains an explicit path */
return fopen(fname, mode);
}
}
if (!pathfind(buf, getenv("PATH"), fname, NULL))
return 0;
return fopen(buf, mode);
}
#endif /* MSWIN */
|
