1 /* SPDX-License-Identifier: GPL-2.0 */
10 #include <sys/types.h>
14 #include "gcc-compat.h"
20 * dss' version of realloc().
22 * \param p Pointer to the memory block, may be \p NULL.
23 * \param size The desired new size.
25 * A wrapper for realloc(3). It calls \p exit(\p EXIT_FAILURE) on errors,
26 * i.e. there is no need to check the return value in the caller.
28 * \return A pointer to the newly allocated memory, which is suitably aligned
29 * for any kind of variable and may be different from \a p.
33 __must_check __malloc
void *dss_realloc(void *p
, size_t size
)
36 * No need to check for NULL pointers: If p is NULL, the call
37 * to realloc is equivalent to malloc(size)
40 if (!(p
= realloc(p
, size
))) {
41 DSS_EMERG_LOG(("realloc failed (size = %zu), aborting\n",
49 * dss' version of malloc().
51 * \param size The desired new size.
53 * A wrapper for malloc(3) which exits on errors.
55 * \return A pointer to the allocated memory, which is suitably aligned for any
60 __must_check __malloc
void *dss_malloc(size_t size
)
67 DSS_EMERG_LOG(("malloc failed (size = %zu), aborting\n",
75 * dss' version of calloc().
77 * \param size The desired new size.
79 * A wrapper for calloc(3) which exits on errors.
81 * \return A pointer to the allocated and zeroed-out memory, which is suitably
82 * aligned for any kind of variable.
86 __must_check __malloc
void *dss_calloc(size_t size
)
88 void *ret
= dss_malloc(size
);
95 * dss' version of strdup().
97 * \param s The string to be duplicated.
99 * A wrapper for strdup(3). It calls \p exit(EXIT_FAILURE) on errors, i.e.
100 * there is no need to check the return value in the caller.
102 * \return A pointer to the duplicated string. If \p s was the NULL pointer,
103 * an pointer to an empty string is returned.
108 __must_check __malloc
char *dss_strdup(const char *s
)
112 if ((ret
= strdup(s
? s
: "")))
114 DSS_EMERG_LOG(("strdup failed, aborting\n"));
119 * Allocate a sufficiently large string and print into it.
121 * \param fmt A usual format string.
123 * Produce output according to \p fmt. No artificial bound on the length of the
124 * resulting string is imposed.
126 * \return This function either returns a pointer to a string that must be
127 * freed by the caller or aborts without returning.
131 __must_check __printf_1_2 __malloc
char *make_message(const char *fmt
, ...)
136 msg
= dss_malloc(size
);
141 /* Try to print in the allocated space. */
143 n
= vsnprintf(msg
, size
, fmt
, ap
);
145 /* If that worked, return the string. */
148 /* Else try again with more space. */
149 size
= n
+ 1; /* precisely what is needed */
150 msg
= dss_realloc(msg
, size
);
155 * Get the home directory of the current user.
157 * \return A dynamically allocated string that must be freed by the caller. If
158 * the home directory could not be found, this function returns "/tmp".
160 __must_check __malloc
char *get_homedir(void)
162 struct passwd
*pw
= getpwuid(getuid());
163 return dss_strdup(pw
? pw
->pw_dir
: "/tmp");
167 * Convert a string to a 64-bit signed integer value.
169 * \param str The string to be converted.
170 * \param value Result pointer.
174 * \sa strtol(3), atoi(3).
176 int dss_atoi64(const char *str
, int64_t *value
)
181 errno
= 0; /* To distinguish success/failure after call */
182 tmp
= strtoll(str
, &endptr
, 10);
183 if (errno
== ERANGE
&& (tmp
== LLONG_MAX
|| tmp
== LLONG_MIN
))
184 return -E_ATOI_OVERFLOW
;
185 if (errno
!= 0 && tmp
== 0) /* other error */
188 return -E_ATOI_NO_DIGITS
;
189 if (*endptr
!= '\0') /* Further characters after number */
190 return -E_ATOI_JUNK_AT_END
;
196 * Get the logname of the current user.
198 * \return A dynamically allocated string that must be freed by the caller. On
199 * errors, the string "unknown user" is returned, i.e. this function never
204 __must_check __malloc
char *dss_logname(void)
206 struct passwd
*pw
= getpwuid(getuid());
207 return dss_strdup(pw
? pw
->pw_name
: "unknown_user");
211 * Split string and return pointers to its parts.
213 * \param args The string to be split.
214 * \param argv_ptr Pointer to the list of substrings.
216 * This function modifies the string given by the first argument by replacing
217 * all occurrences of space and '\t' characters by '\0'. A NULL-terminated
218 * array of pointers to char * is allocated dynamically, and these pointers are
219 * initialized to point to the broken-up substrings. A pointer to this array
220 * is returned via the last argument.
222 * \return The number of substrings found.
224 unsigned split_args(char *args
, char *** const argv_ptr
)
229 const char delim
[] = " \t";
231 p
= args
+ strspn(args
, delim
);
233 i
= strcspn(p
, delim
);
238 p
+= strspn(p
, delim
);
240 *argv_ptr
= dss_malloc((n
+ 1) * sizeof(char *));
243 p
= args
+ strspn(args
, delim
);
246 j
= strcspn(p
, delim
);
249 p
+= strcspn(p
, delim
);
253 p
+= strspn(p
, delim
);