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read-file.c

Absolute File Name:/home/opencoverage/opencoverage/guest-scripts/coreutils/src/lib/read-file.c
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1/* read-file.c -- read file contents into a string-
2 Copyright (C) 2006, 2009-2018 Free Software Foundation, Inc.-
3 Written by Simon Josefsson and Bruno Haible.-
4-
5 This program is free software; you can redistribute it and/or modify-
6 it under the terms of the GNU General Public License as published by-
7 the Free Software Foundation; either version 3, or (at your option)-
8 any later version.-
9-
10 This program is distributed in the hope that it will be useful,-
11 but WITHOUT ANY WARRANTY; without even the implied warranty of-
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the-
13 GNU General Public License for more details.-
14-
15 You should have received a copy of the GNU General Public License-
16 along with this program; if not, see <https://www.gnu.org/licenses/>. */-
17-
18#include <config.h>-
19-
20#include "read-file.h"-
21-
22/* Get fstat. */-
23#include <sys/stat.h>-
24-
25/* Get ftello. */-
26#include <stdio.h>-
27-
28/* Get SIZE_MAX. */-
29#include <stdint.h>-
30-
31/* Get malloc, realloc, free. */-
32#include <stdlib.h>-
33-
34/* Get errno. */-
35#include <errno.h>-
36-
37/* Read a STREAM and return a newly allocated string with the content,-
38 and set *LENGTH to the length of the string. The string is-
39 zero-terminated, but the terminating zero byte is not counted in-
40 *LENGTH. On errors, *LENGTH is undefined, errno preserves the-
41 values set by system functions (if any), and NULL is returned. */-
42char *-
43fread_file (FILE *stream, size_t *length)-
44{-
45 char *buf = NULL;-
46 size_t alloc = BUFSIZ;-
47-
48 /* For a regular file, allocate a buffer that has exactly the right-
49 size. This avoids the need to do dynamic reallocations later. */-
50 {-
51 struct stat st;-
52-
53 if (fstat (fileno (stream), &st) >= 0 && S_ISREG (st.st_mode))
fstat (fileno ...am), &st) >= 0Description
TRUEevaluated 41 times by 2 tests
Evaluated by:
  • ptx
  • shuf
FALSEnever evaluated
(((( st.st_mod... == (0100000))Description
TRUEevaluated 25 times by 2 tests
Evaluated by:
  • ptx
  • shuf
FALSEevaluated 16 times by 2 tests
Evaluated by:
  • ptx
  • shuf
0-41
54 {-
55 off_t pos = ftello (stream);-
56-
57 if (pos >= 0 && pos < st.st_size)
pos >= 0Description
TRUEevaluated 25 times by 2 tests
Evaluated by:
  • ptx
  • shuf
FALSEnever evaluated
pos < st.st_sizeDescription
TRUEevaluated 22 times by 2 tests
Evaluated by:
  • ptx
  • shuf
FALSEevaluated 3 times by 1 test
Evaluated by:
  • ptx
0-25
58 {-
59 off_t alloc_off = st.st_size - pos;-
60-
61 /* '1' below, accounts for the trailing NUL. */-
62 if (SIZE_MAX - 1 < alloc_off)
(1844674407370... 1 < alloc_offDescription
TRUEnever evaluated
FALSEevaluated 22 times by 2 tests
Evaluated by:
  • ptx
  • shuf
0-22
63 {-
64 errno = ENOMEM;-
65 return NULL;
never executed: return ((void *)0) ;
0
66 }-
67-
68 alloc = alloc_off + 1;-
69 }
executed 22 times by 2 tests: end of block
Executed by:
  • ptx
  • shuf
22
70 }
executed 25 times by 2 tests: end of block
Executed by:
  • ptx
  • shuf
25
71 }-
72-
73 if (!(buf = malloc (alloc)))
!(buf = malloc (alloc))Description
TRUEnever evaluated
FALSEevaluated 41 times by 2 tests
Evaluated by:
  • ptx
  • shuf
0-41
74 return NULL; /* errno is ENOMEM. */
never executed: return ((void *)0) ;
0
75-
76 {-
77 size_t size = 0; /* number of bytes read so far */-
78 int save_errno;-
79-
80 for (;;)-
81 {-
82 /* This reads 1 more than the size of a regular file-
83 so that we get eof immediately. */-
84 size_t requested = alloc - size;-
85 size_t count = fread (buf + size, 1, requested, stream);-
86 size += count;-
87-
88 if (count != requested)
count != requestedDescription
TRUEevaluated 41 times by 2 tests
Evaluated by:
  • ptx
  • shuf
FALSEevaluated 1 time by 1 test
Evaluated by:
  • shuf
1-41
89 {-
90 save_errno = errno;-
91 if (ferror (stream))
ferror (stream)Description
TRUEnever evaluated
FALSEevaluated 41 times by 2 tests
Evaluated by:
  • ptx
  • shuf
0-41
92 break;
never executed: break;
0
93-
94 /* Shrink the allocated memory if possible. */-
95 if (size < alloc - 1)
size < alloc - 1Description
TRUEevaluated 19 times by 2 tests
Evaluated by:
  • ptx
  • shuf
FALSEevaluated 22 times by 2 tests
Evaluated by:
  • ptx
  • shuf
19-22
96 {-
97 char *smaller_buf = realloc (buf, size + 1);-
98 if (smaller_buf != NULL)
smaller_buf != ((void *)0)Description
TRUEevaluated 19 times by 2 tests
Evaluated by:
  • ptx
  • shuf
FALSEnever evaluated
0-19
99 buf = smaller_buf;
executed 19 times by 2 tests: buf = smaller_buf;
Executed by:
  • ptx
  • shuf
19
100 }
executed 19 times by 2 tests: end of block
Executed by:
  • ptx
  • shuf
19
101-
102 buf[size] = '\0';-
103 *length = size;-
104 return buf;
executed 41 times by 2 tests: return buf;
Executed by:
  • ptx
  • shuf
41
105 }-
106-
107 {-
108 char *new_buf;-
109-
110 if (alloc == SIZE_MAX)
alloc == (1844...73709551615UL)Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • shuf
0-1
111 {-
112 save_errno = ENOMEM;-
113 break;
never executed: break;
0
114 }-
115-
116 if (alloc < SIZE_MAX - alloc / 2)
alloc < (18446...L) - alloc / 2Description
TRUEevaluated 1 time by 1 test
Evaluated by:
  • shuf
FALSEnever evaluated
0-1
117 alloc = alloc + alloc / 2;
executed 1 time by 1 test: alloc = alloc + alloc / 2;
Executed by:
  • shuf
1
118 else-
119 alloc = SIZE_MAX;
never executed: alloc = (18446744073709551615UL) ;
0
120-
121 if (!(new_buf = realloc (buf, alloc)))
!(new_buf = re... (buf, alloc))Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • shuf
0-1
122 {-
123 save_errno = errno;-
124 break;
never executed: break;
0
125 }-
126-
127 buf = new_buf;-
128 }-
129 }
executed 1 time by 1 test: end of block
Executed by:
  • shuf
1
130-
131 free (buf);-
132 errno = save_errno;-
133 return NULL;
never executed: return ((void *)0) ;
0
134 }-
135}-
136-
137static char *-
138internal_read_file (const char *filename, size_t *length, const char *mode)-
139{-
140 FILE *stream = fopen (filename, mode);-
141 char *out;-
142 int save_errno;-
143-
144 if (!stream)
!streamDescription
TRUEnever evaluated
FALSEevaluated 15 times by 1 test
Evaluated by:
  • ptx
0-15
145 return NULL;
never executed: return ((void *)0) ;
0
146-
147 out = fread_file (stream, length);-
148-
149 save_errno = errno;-
150-
151 if (fclose (stream) != 0)
rpl_fclose (stream) != 0Description
TRUEnever evaluated
FALSEevaluated 15 times by 1 test
Evaluated by:
  • ptx
0-15
152 {-
153 if (out)
outDescription
TRUEnever evaluated
FALSEnever evaluated
0
154 {-
155 save_errno = errno;-
156 free (out);-
157 }
never executed: end of block
0
158 errno = save_errno;-
159 return NULL;
never executed: return ((void *)0) ;
0
160 }-
161-
162 return out;
executed 15 times by 1 test: return out;
Executed by:
  • ptx
15
163}-
164-
165/* Open and read the contents of FILENAME, and return a newly-
166 allocated string with the content, and set *LENGTH to the length of-
167 the string. The string is zero-terminated, but the terminating-
168 zero byte is not counted in *LENGTH. On errors, *LENGTH is-
169 undefined, errno preserves the values set by system functions (if-
170 any), and NULL is returned. */-
171char *-
172read_file (const char *filename, size_t *length)-
173{-
174 return internal_read_file (filename, length, "r");
executed 15 times by 1 test: return internal_read_file (filename, length, "r");
Executed by:
  • ptx
15
175}-
176-
177/* Open (on non-POSIX systems, in binary mode) and read the contents-
178 of FILENAME, and return a newly allocated string with the content,-
179 and set LENGTH to the length of the string. The string is-
180 zero-terminated, but the terminating zero byte is not counted in-
181 the LENGTH variable. On errors, *LENGTH is undefined, errno-
182 preserves the values set by system functions (if any), and NULL is-
183 returned. */-
184char *-
185read_binary_file (const char *filename, size_t *length)-
186{-
187 return internal_read_file (filename, length, "rb");
never executed: return internal_read_file (filename, length, "rb");
0
188}-
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