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1 | /*- |
2 | * Copyright (c) 1992 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * This code is derived from software contributed to Berkeley by | |
6 | * Rodney Ruddock of the University of Guelph. | |
7 | * | |
8 | * %sccs.include.redist.c% | |
9 | */ | |
10 | ||
11 | #ifndef lint | |
f3721604 | 12 | static char sccsid[] = "@(#)r.c 5.4 (Berkeley) %G%"; |
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13 | #endif /* not lint */ |
14 | ||
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15 | #include <sys/types.h> |
16 | #include <sys/stat.h> | |
17 | ||
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18 | #include <a.out.h> |
19 | #include <errno.h> | |
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20 | #include <regex.h> |
21 | #include <setjmp.h> | |
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
24 | #include <string.h> | |
25 | ||
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26 | #ifdef DBI |
27 | #include <db.h> | |
28 | #endif | |
29 | ||
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30 | #include "ed.h" |
31 | #include "extern.h" | |
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32 | |
33 | /* | |
34 | * This sets up things for the central input routine to place the | |
35 | * incoming text at the proper place in the buffer. | |
36 | */ | |
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37 | void |
38 | r(inputt, errnum) | |
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39 | FILE *inputt; |
40 | int *errnum; | |
efe5b60f | 41 | { |
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42 | struct exec l_magic; |
43 | struct stat l_s_buf; | |
44 | FILE *l_fp; | |
45 | long l_num; | |
e692f66f | 46 | char *l_filename_read=NULL, *l_temp; |
ecbf4ad0 | 47 | int l_srv; |
efe5b60f | 48 | |
ecbf4ad0 | 49 | if (filename_flag == 1) { |
e692f66f | 50 | sigspecial++; |
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51 | l_filename_read = filename_current; |
52 | filename_flag = 0; | |
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53 | sigspecial--; |
54 | if (sigint_flag && (!sigspecial)) | |
55 | SIGINT_ACTION; | |
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56 | } else { |
57 | l_temp = filename(inputt, errnum); | |
58 | if (*errnum == 1) | |
59 | l_filename_read = l_temp; | |
60 | else | |
61 | if (*errnum == -2) { | |
62 | while (((ss = getc(inputt)) != '\n') || | |
63 | (ss == EOF)); | |
64 | l_filename_read = filename_current; | |
65 | } else | |
66 | if (*errnum < 0) | |
67 | return; | |
68 | *errnum = 0; | |
69 | } | |
efe5b60f | 70 | |
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71 | if (filename_current == NULL) { |
72 | if (l_filename_read == NULL) { | |
73 | strcpy(help_msg, "no filename given"); | |
74 | *errnum = -1; | |
75 | if (ss) | |
76 | ungetc('\n', inputt); | |
77 | return; | |
78 | } else | |
79 | filename_current = l_filename_read; | |
80 | } | |
efe5b60f | 81 | |
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82 | /* |
83 | * Determine if the file can be read. If not set the help message to | |
84 | * something descriptive that the user should understand. | |
85 | */ | |
86 | if (((l_srv = stat(l_filename_read, &l_s_buf)) == -1) || | |
87 | (l_s_buf.st_mode & S_IFDIR)) { | |
88 | if (l_srv == -1) | |
89 | strcpy(help_msg, strerror(errno)); | |
90 | else | |
91 | strcpy(help_msg, | |
92 | "filename is directory, not a text file"); | |
93 | printf("?%s\n", l_filename_read); | |
94 | *errnum = 0; | |
95 | return; | |
96 | } | |
97 | if ((l_fp = fopen(l_filename_read, "r")) == NULL) { | |
98 | strcpy(help_msg, "permission lacking to read file"); | |
99 | printf("?%s\n", l_filename_read); | |
100 | *errnum = 0; | |
101 | return; | |
102 | } | |
103 | /* | |
104 | * There is permission to read the file, but if it's an executable | |
105 | * file of the object code and linked type, we really don't want to | |
106 | * look at it (according to ed spec's). | |
107 | */ | |
108 | if (fread(&l_magic, sizeof(struct exec), 1, l_fp) != 0) { | |
109 | if (!(N_BADMAG(l_magic))) { | |
110 | strcpy(help_msg, "unable to read executable file"); | |
111 | printf("?%s\n", l_filename_read); | |
112 | *errnum = 0; | |
113 | return; | |
114 | } | |
115 | } | |
116 | fseek(l_fp, (off_t)0, 0); | |
117 | if (g_flag == 0) | |
118 | u_clr_stk(); | |
119 | l_num = input_lines(l_fp, errnum); | |
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120 | if (*errnum < 0) |
121 | return; | |
122 | *errnum = 0; | |
efe5b60f | 123 | |
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124 | if (explain_flag) /* !=0 */ |
125 | printf("%ld\n", l_num); | |
126 | if (l_filename_read != filename_current) | |
127 | free(l_filename_read); | |
efe5b60f | 128 | |
f3721604 | 129 | fclose(l_fp); |
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130 | change_flag = 1; |
131 | if (sigint_flag) | |
132 | SIGINT_ACTION; | |
133 | *errnum = 1; | |
134 | } |