--- /dev/null
+/*
+ * Copyright (C) 2004-2010 Andre Noll <maan@systemlinux.org>
+ *
+ * Licensed under the GPL v2. For licencing details see COPYING.
+ */
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <assert.h>
+#include <limits.h>
+#include <errno.h>
+#include <pwd.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+
+#include "gcc-compat.h"
+#include "log.h"
+#include "err.h"
+#include "str.h"
+
+/**
+ * Write a message to a dynamically allocated string.
+ *
+ * \param fmt Usual format string.
+ * \param p Result pointer.
+ *
+ * \sa printf(3). */
+#define VSPRINTF(fmt, p) \
+{ \
+ int n; \
+ size_t size = 100; \
+ p = dss_malloc(size); \
+ while (1) { \
+ va_list ap; \
+ /* Try to print in the allocated space. */ \
+ va_start(ap, fmt); \
+ n = vsnprintf(p, size, fmt, ap); \
+ va_end(ap); \
+ /* If that worked, return the string. */ \
+ if (n > -1 && n < size) \
+ break; \
+ /* Else try again with more space. */ \
+ if (n > -1) /* glibc 2.1 */ \
+ size = n + 1; /* precisely what is needed */ \
+ else /* glibc 2.0 */ \
+ size *= 2; /* twice the old size */ \
+ p = dss_realloc(p, size); \
+ } \
+}
+
+/**
+ * dss' version of realloc().
+ *
+ * \param p Pointer to the memory block, may be \p NULL.
+ * \param size The desired new size.
+ *
+ * A wrapper for realloc(3). It calls \p exit(\p EXIT_FAILURE) on errors,
+ * i.e. there is no need to check the return value in the caller.
+ *
+ * \return A pointer to the newly allocated memory, which is suitably aligned
+ * for any kind of variable and may be different from \a p.
+ *
+ * \sa realloc(3).
+ */
+__must_check __malloc void *dss_realloc(void *p, size_t size)
+{
+ /*
+ * No need to check for NULL pointers: If p is NULL, the call
+ * to realloc is equivalent to malloc(size)
+ */
+ assert(size);
+ if (!(p = realloc(p, size))) {
+ DSS_EMERG_LOG("realloc failed (size = %zu), aborting\n",
+ size);
+ exit(EXIT_FAILURE);
+ }
+ return p;
+}
+
+/**
+ * dss' version of malloc().
+ *
+ * \param size The desired new size.
+ *
+ * A wrapper for malloc(3) which exits on errors.
+ *
+ * \return A pointer to the allocated memory, which is suitably aligned for any
+ * kind of variable.
+ *
+ * \sa malloc(3).
+ */
+__must_check __malloc void *dss_malloc(size_t size)
+{
+ void *p;
+ assert(size);
+ p = malloc(size);
+
+ if (!p) {
+ DSS_EMERG_LOG("malloc failed (size = %zu), aborting\n",
+ size);
+ exit(EXIT_FAILURE);
+ }
+ return p;
+}
+
+/**
+ * dss' version of calloc().
+ *
+ * \param size The desired new size.
+ *
+ * A wrapper for calloc(3) which exits on errors.
+ *
+ * \return A pointer to the allocated and zeroed-out memory, which is suitably
+ * aligned for any kind of variable.
+ *
+ * \sa calloc(3)
+ */
+__must_check __malloc void *dss_calloc(size_t size)
+{
+ void *ret = dss_malloc(size);
+
+ memset(ret, 0, size);
+ return ret;
+}
+
+/**
+ * dss' version of strdup().
+ *
+ * \param s The string to be duplicated.
+ *
+ * A wrapper for strdup(3). It calls \p exit(EXIT_FAILURE) on errors, i.e.
+ * there is no need to check the return value in the caller.
+ *
+ * \return A pointer to the duplicated string. If \p s was the NULL pointer,
+ * an pointer to an empty string is returned.
+ *
+ * \sa strdup(3)
+ */
+
+__must_check __malloc char *dss_strdup(const char *s)
+{
+ char *ret;
+
+ if ((ret = strdup(s? s: "")))
+ return ret;
+ DSS_EMERG_LOG("strdup failed, aborting\n");
+ exit(EXIT_FAILURE);
+}
+
+/**
+ * Allocate a sufficiently large string and print into it.
+ *
+ * \param fmt A usual format string.
+ *
+ * Produce output according to \p fmt. No artificial bound on the length of the
+ * resulting string is imposed.
+ *
+ * \return This function either returns a pointer to a string that must be
+ * freed by the caller or aborts without returning.
+ *
+ * \sa printf(3).
+ */
+__must_check __printf_1_2 __malloc char *make_message(const char *fmt, ...)
+{
+ char *msg;
+
+ VSPRINTF(fmt, msg);
+ return msg;
+}
+
+/**
+ * Get the home directory of the current user.
+ *
+ * \return A dynammically allocated string that must be freed by the caller. If
+ * the home directory could not be found, this function returns "/tmp".
+ */
+__must_check __malloc char *get_homedir(void)
+{
+ struct passwd *pw = getpwuid(getuid());
+ return dss_strdup(pw? pw->pw_dir : "/tmp");
+}
+
+/**
+ * Convert a string to a 64-bit signed integer value.
+ *
+ * \param str The string to be converted.
+ * \param value Result pointer.
+ *
+ * \return Standard.
+ *
+ * \sa strtol(3), atoi(3).
+ */
+int dss_atoi64(const char *str, int64_t *value)
+{
+ char *endptr;
+ long long tmp;
+
+ errno = 0; /* To distinguish success/failure after call */
+ tmp = strtoll(str, &endptr, 10);
+ if (errno == ERANGE && (tmp == LLONG_MAX || tmp == LLONG_MIN))
+ return -E_ATOI_OVERFLOW;
+ if (errno != 0 && tmp == 0) /* other error */
+ return -E_STRTOLL;
+ if (endptr == str)
+ return -E_ATOI_NO_DIGITS;
+ if (*endptr != '\0') /* Further characters after number */
+ return -E_ATOI_JUNK_AT_END;
+ *value = tmp;
+ return 1;
+}
+
+/**
+ * Get the logname of the current user.
+ *
+ * \return A dynammically allocated string that must be freed by the caller. On
+ * errors, the string "unknown user" is returned, i.e. this function never
+ * returns \p NULL.
+ *
+ * \sa getpwuid(3).
+ */
+__must_check __malloc char *dss_logname(void)
+{
+ struct passwd *pw = getpwuid(getuid());
+ return dss_strdup(pw? pw->pw_name : "unknown_user");
+}
+
+/**
+ * Split string and return pointers to its parts.
+ *
+ * \param args The string to be split.
+ * \param argv_ptr Pointer to the list of substrings.
+ * \param delim Delimiter.
+ *
+ * This function modifies \a args by replacing each occurance of \a delim by
+ * zero. A \p NULL-terminated array of pointers to char* is allocated dynamically
+ * and these pointers are initialized to point to the broken-up substrings
+ * within \a args. A pointer to this array is returned via \a argv_ptr.
+ *
+ * \return The number of substrings found in \a args.
+ */
+unsigned split_args(char *args, char *** const argv_ptr, const char *delim)
+{
+ char *p = args;
+ char **argv;
+ size_t n = 0, i, j;
+
+ p = args + strspn(args, delim);
+ for (;;) {
+ i = strcspn(p, delim);
+ if (!i)
+ break;
+ p += i;
+ n++;
+ p += strspn(p, delim);
+ }
+ *argv_ptr = dss_malloc((n + 1) * sizeof(char *));
+ argv = *argv_ptr;
+ i = 0;
+ p = args + strspn(args, delim);
+ while (p) {
+ argv[i] = p;
+ j = strcspn(p, delim);
+ if (!j)
+ break;
+ p += strcspn(p, delim);
+ if (*p) {
+ *p = '\0';
+ p++;
+ p += strspn(p, delim);
+ }
+ i++;
+ }
+ argv[n] = NULL;
+ return n;
+}
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