13 #include "gcc-compat.h"
18 __noreturn void clean_exit(int status);
21 * Write a message to a dynamically allocated string.
23 * \param fmt Usual format string.
24 * \param p Result pointer.
27 #define VSPRINTF(fmt, p) \
31 p = dss_malloc(size); \
34 /* Try to print in the allocated space. */ \
36 n = vsnprintf(p, size, fmt, ap); \
38 /* If that worked, return the string. */ \
39 if (n > -1 && n < size) \
41 /* Else try again with more space. */ \
42 if (n > -1) /* glibc 2.1 */ \
43 size = n + 1; /* precisely what is needed */ \
44 else /* glibc 2.0 */ \
45 size *= 2; /* twice the old size */ \
46 p = dss_realloc(p, size); \
51 * dss' version of realloc().
53 * \param p Pointer to the memory block, may be \p NULL.
54 * \param size The desired new size.
56 * A wrapper for realloc(3). It calls \p exit(\p EXIT_FAILURE) on errors,
57 * i.e. there is no need to check the return value in the caller.
59 * \return A pointer to the newly allocated memory, which is suitably aligned
60 * for any kind of variable and may be different from \a p.
64 __must_check __malloc void *dss_realloc(void *p, size_t size)
67 * No need to check for NULL pointers: If p is NULL, the call
68 * to realloc is equivalent to malloc(size)
71 if (!(p = realloc(p, size))) {
72 DSS_EMERG_LOG("realloc failed (size = %zu), aborting\n",
74 clean_exit(EXIT_FAILURE);
80 * dss' version of malloc().
82 * \param size The desired new size.
84 * A wrapper for malloc(3) which exits on errors.
86 * \return A pointer to the allocated memory, which is suitably aligned for any
91 __must_check __malloc void *dss_malloc(size_t size)
94 void *p = malloc(size);
97 DSS_EMERG_LOG("malloc failed (size = %zu), aborting\n",
99 clean_exit(EXIT_FAILURE);
105 * dss' version of calloc().
107 * \param size The desired new size.
109 * A wrapper for calloc(3) which exits on errors.
111 * \return A pointer to the allocated and zeroed-out memory, which is suitably
112 * aligned for any kind of variable.
116 __must_check __malloc void *dss_calloc(size_t size)
118 void *ret = dss_malloc(size);
120 memset(ret, 0, size);
125 * dss' version of strdup().
127 * \param s The string to be duplicated.
129 * A wrapper for strdup(3). It calls \p exit(EXIT_FAILURE) on errors, i.e.
130 * there is no need to check the return value in the caller.
132 * \return A pointer to the duplicated string. If \p s was the NULL pointer,
133 * an pointer to an empty string is returned.
138 __must_check __malloc char *dss_strdup(const char *s)
142 if ((ret = strdup(s? s: "")))
144 DSS_EMERG_LOG("strdup failed, aborting\n");
145 clean_exit(EXIT_FAILURE);
149 * Allocate a sufficiently large string and print into it.
151 * \param fmt A usual format string.
153 * Produce output according to \p fmt. No artificial bound on the length of the
154 * resulting string is imposed.
156 * \return This function either returns a pointer to a string that must be
157 * freed by the caller or aborts without returning.
161 __must_check __printf_1_2 __malloc char *make_message(const char *fmt, ...)
169 __printf_1_2 void make_err_msg(const char* fmt,...)
172 VSPRINTF(fmt, dss_error_txt);
176 * Get the home directory of the current user.
178 * \return A dynammically allocated string that must be freed by the caller. If
179 * the home directory could not be found, this function returns "/tmp".
181 __must_check __malloc char *get_homedir(void)
183 struct passwd *pw = getpwuid(getuid());
184 return dss_strdup(pw? pw->pw_dir : "/tmp");
188 * Convert a string to a 64-bit signed integer value.
190 * \param str The string to be converted.
191 * \param value Result pointer.
195 * \sa strtol(3), atoi(3).
197 int dss_atoi64(const char *str, int64_t *value)
202 errno = 0; /* To distinguish success/failure after call */
203 tmp = strtoll(str, &endptr, 10);
204 if (errno == ERANGE && (tmp == LLONG_MAX || tmp == LLONG_MIN)) {
205 make_err_msg("%s", str);
206 return -E_ATOI_OVERFLOW;
208 if (errno != 0 && tmp == 0) { /* other error */
209 make_err_msg("%s", str);
213 make_err_msg("%s", str);
214 return -E_ATOI_NO_DIGITS;
216 if (*endptr != '\0') { /* Further characters after number */
217 make_err_msg("%s", str);
218 return -E_ATOI_JUNK_AT_END;
225 * Get the logname of the current user.
227 * \return A dynammically allocated string that must be freed by the caller. On
228 * errors, the string "unknown user" is returned, i.e. this function never
233 __must_check __malloc char *dss_logname(void)
235 struct passwd *pw = getpwuid(getuid());
236 return dss_strdup(pw? pw->pw_name : "unknown_user");