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comparison nt/minitar.c @ 495:02f7a782086f

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[xemacs-hg @ 2001-05-01 09:36:44 by ben] * config.inc.samp (MAKEINFO): point at more standard c: not f:. Fix more compiler warnings, clean up the style to conform more to standard XEmacs.
author ben
date Tue, 01 May 2001 09:36:44 +0000
parents 5aa1854ad537
children f846c2ef930d
comparison
equal deleted inserted replaced
494:4137b1fb7b90 495:02f7a782086f
18 #include <io.h> 18 #include <io.h>
19 19
20 #include <zlib.h> 20 #include <zlib.h>
21 21
22 static int 22 static int
23 Usage(char *name) 23 Usage (char *name)
24 { 24 {
25 fprintf(stderr,"Usage: %s file.tar.gz [base-dir]\n",name); 25 fprintf (stderr, "Usage: %s file.tar.gz [base-dir]\n", name);
26 fprintf(stderr,"\tExtracts the contents compressed tar file to base-dir\n"); 26 fprintf (stderr, "\tExtracts the contents compressed tar file to base-dir\n");
27 exit(-1); 27 exit (-1);
28 return 0;
28 } 29 }
29 30
30 31
31 #define BLOCKSIZE 512 32 #define BLOCKSIZE 512
32 #define MAXNAMELEN 1024 33 #define MAXNAMELEN 1024
33 34
34 static int 35 static int
35 octal(char *str) 36 octal (char *str)
36 { 37 {
37 int ret = -1; 38 int ret = -1;
38 sscanf(str,"%o",&ret); 39 sscanf (str, "%o", &ret);
39 return ret; 40 return ret;
40 } 41 }
41 42
42 /* this is like mkdir -p, except if there is no trailing slash, 43 /* this is like mkdir -p, except if there is no trailing slash,
43 the final component is assumed to be a file, rather than a 44 the final component is assumed to be a file, rather than a
44 path component, so it is not created as a directory */ 45 path component, so it is not created as a directory */
45 46
46 static int 47 static int
47 makepath(char *path) 48 makepath (char *path)
48 { 49 {
49 char tmp[MAXNAMELEN]; 50 char tmp[MAXNAMELEN];
50 char *cp; 51 char *cp;
51 52
52 for (cp=path; cp; cp = (char*)strchr(cp+1,'/')){ 53 for (cp=path; cp; cp = (char*)strchr (cp+1, '/'))
53 if (!*cp) 54 {
54 break; 55 if (!*cp)
55 if (*cp != '/') 56 break;
56 continue; 57 if (*cp != '/')
57 strncpy(tmp, path, cp-path); 58 continue;
58 tmp[cp-path] = '\0'; 59 strncpy (tmp, path, cp-path);
59 if (strlen(tmp) == 0) 60 tmp[cp-path] = '\0';
60 continue; 61 if (strlen (tmp) == 0)
62 continue;
61 #ifdef WIN32_NATIVE 63 #ifdef WIN32_NATIVE
62 if (mkdir(tmp)){ 64 if (mkdir (tmp))
63 #else 65 #else
64 if (mkdir(tmp,0777)){ 66 if (mkdir (tmp, 0777))
65 #endif 67 #endif
66 if (errno == EEXIST) 68 {
67 continue; 69 if (errno == EEXIST)
68 else 70 continue;
69 return -1; 71 else
72 return -1;
73 }
70 } 74 }
71 }
72 return 0; 75 return 0;
73 } 76 }
74 77
75 78
76
77 79
78 int 80 int
79 main(int argc, char **argv) 81 main (int argc, char **argv)
80 { 82 {
81 char fullname[MAXNAMELEN]; 83 char fullname[MAXNAMELEN];
82 char *basedir = "."; 84 char *basedir = ".";
83 char *tarfile; 85 char *tarfile;
84 int size; 86 int size;
95 97
96 int in_block = 0; 98 int in_block = 0;
97 int directory = 0; 99 int directory = 0;
98 100
99 if (argc < 2 || argc > 3) 101 if (argc < 2 || argc > 3)
100 Usage(argv[0]); 102 Usage (argv[0]);
101 103
102 tarfile = argv[1]; 104 tarfile = argv[1];
103 if (argc==3) 105 if (argc==3)
104 basedir = argv[2]; 106 basedir = argv[2];
105 107
106 if (! (infile = gzopen(tarfile,"rb"))){ 108 if (! (infile = gzopen (tarfile, "rb")))
107 fprintf(stderr,"Cannot open %s\n", tarfile); 109 {
108 exit(-2); 110 fprintf (stderr, "Cannot open %s\n", tarfile);
109 } 111 exit (-2);
112 }
110 113
111 while (1){ 114 while (1)
115 {
116 nread = gzread (infile, block, 512);
117
118 if (!in_block && nread == 0)
119 break;
120
121 if (nread != BLOCKSIZE)
122 {
123 fprintf (stderr, "Error: incomplete block read. Exiting.\n");
124 exit (-2);
125 }
126
127 if (!in_block)
128 {
129 if (block[0]=='\0') /* We're done */
130 break;
131
132 strncpy (magic, block+257, 6);
133 magic[6] = '\0';
134 if (strcmp (magic, "ustar "))
135 {
136 fprintf (stderr,
137 "Error: incorrect magic number in tar header. Exiting\n");
138 }
139
140 strncpy (name, block, 100);
141 name[100] = '\0';
142 sprintf (fullname, "%s/%s", basedir, name);
143 printf ("%s\n", fullname);
144 type = block[156];
145
146 switch (type)
147 {
148 case '0':
149 case '\0':
150 directory = 0;
151 break;
152 case '5':
153 directory = 1;
154 break;
155 default:
156 fprintf (stderr, "Error: unknown type flag %c. Exiting.\n", type);
157 break;
158 }
159
160 if (directory)
161 {
162 in_block = 0;
163
164 /* makepath will ignore the final path component, so make sure
165 dirnames have a trailing slash */
166
167 if (fullname[strlen (fullname)-1] != '/')
168 strcat (fullname, "/");
169 if (makepath (fullname))
170 {
171 fprintf (stderr, "Error: cannot create directory %s. Exiting.\n",
172 fullname);
173 exit (-2);
174 }
175 continue;
176 }
177 else
178 { /*file */
179 in_block = 1;
180 if (outfile)
181 {
182 if (fclose (outfile))
183 {
184 fprintf (stderr, "Error: cannot close file %s. Exiting.\n",
185 fullname);
186 exit (-2);
187 }
188 outfile = (FILE*)0;
189 }
190
191 if (!(outfile = fopen (fullname, "wb")))
192 {
193 /*try creating the directory, maybe it's not there */
194 if (makepath (fullname))
195 {
196 fprintf (stderr, "Error: cannot create file %s. Exiting.\n",
197 fullname);
198 exit (-2);
199 }
200 /* now try again to open the file */
201 if (!(outfile = fopen (fullname, "wb")))
202 {
203 fprintf (stderr, "Error: cannot create file %s. Exiting.\n",
204 fullname);
205 exit (-2);
206 }
207 }
208
209 strncpy (osize, block+124, 12);
210 osize[12] = '\0';
211 size = octal (osize);
212 if (size<0)
213 {
214 fprintf (stderr, "Error: invalid size in tar header. Exiting.\n");
215 exit (-2);
216 }
217 }
218 } else { /* write or continue writing file contents */
219 nbytes = size>512? 512:size;
220
221 nwritten = fwrite (block, 1, nbytes, outfile);
222 if (nwritten != nbytes)
223 {
224 fprintf (stderr, "Error: only wrote %d bytes to file %s. Exiting.\n",
225 nwritten, fullname);
226 }
227 size -= nbytes;
228 if (size==0)
229 in_block = 0;
230 }
231 }
232 return 0;
233 }
234
235
112 236
113
114 nread = gzread(infile,block,512);
115
116 if (!in_block && nread == 0)
117 break;
118
119 if (nread != BLOCKSIZE){
120 fprintf(stderr,"Error: incomplete block read. Exiting.\n");
121 exit(-2);
122 }
123
124 if (!in_block){
125 if (block[0]=='\0') /* We're done */
126 break;
127
128 strncpy(magic,block+257,6);
129 magic[6] = '\0';
130 if (strcmp(magic,"ustar ")){
131 fprintf(stderr,
132 "Error: incorrect magic number in tar header. Exiting\n");
133 }
134
135 strncpy(name,block,100);
136 name[100] = '\0';
137 sprintf(fullname,"%s/%s",basedir,name);
138 printf("%s\n",fullname);
139 type = block[156];
140
141 switch(type){
142 case '0':
143 case '\0':
144 directory = 0;
145 break;
146 case '5':
147 directory = 1;
148 break;
149 default:
150 fprintf(stderr,"Error: unknown type flag %c. Exiting.\n",type);
151 break;
152 }
153
154 if (directory){
155 in_block = 0;
156
157 /* makepath will ignore the final path component, so make sure
158 dirnames have a trailing slash */
159
160 if (fullname[strlen(fullname)-1] != '/')
161 strcat(fullname,"/");
162 if (makepath(fullname)){
163 fprintf(stderr, "Error: cannot create directory %s. Exiting.\n",
164 fullname);
165 exit(-2);
166 }
167 continue;
168 } else { /*file */
169 in_block = 1;
170 if (outfile){
171 if (fclose(outfile)){
172 fprintf(stderr,"Error: cannot close file %s. Exiting.\n",
173 fullname);
174 exit(-2);
175 }
176 outfile = (FILE*)0;
177 }
178
179 if ( !(outfile = fopen(fullname,"wb"))){
180 /*try creating the directory, maybe it's not there */
181 if (makepath(fullname)){
182 fprintf(stderr,"Error: cannot create file %s. Exiting.\n",
183 fullname);
184 exit(-2);
185 }
186 /* now try again to open the file */
187 if (!(outfile = fopen(fullname,"wb"))){
188 fprintf(stderr,"Error: cannot create file %s. Exiting.\n",
189 fullname);
190 exit(-2);
191 }
192 }
193
194 strncpy(osize,block+124,12);
195 osize[12] = '\0';
196 size = octal(osize);
197 if (size<0){
198 fprintf(stderr,"Error: invalid size in tar header. Exiting.\n");
199 exit(-2);
200 }
201 }
202 } else { /* write or continue writing file contents */
203 nbytes = size>512? 512:size;
204
205 nwritten = fwrite(block, 1, nbytes, outfile);
206 if (nwritten != nbytes){
207 fprintf(stderr, "Error: only wrote %d bytes to file %s. Exiting.\n",
208 nwritten, fullname);
209 }
210 size -= nbytes;
211 if (size==0)
212 in_block = 0;
213 }
214 }
215 exit (0);
216 }
217
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219
220