add an extra level of indirection to main()

[thirdparty/git.git] / git-compat-util.h

diff --git a/git-compat-util.h b/git-compat-util.h
index c062ddfb5a80ea3f2931a1ed7f706a7812b72123..91e366d1dd50902dc5249907e405339ed104e964 100644 (file)
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -237,7 +237,7 @@ typedef unsigned long uintptr_t;
 #else
 #define precompose_str(in,i_nfd2nfc)
 #define precompose_argv(c,v)
-#define probe_utf8_pathname_composition(a,b)
+#define probe_utf8_pathname_composition()
 #endif
 
 #ifdef MKDIR_WO_TRAILING_SLASH
@@ -261,6 +261,8 @@ struct itimerval {
 #else
 #define basename gitbasename
 extern char *gitbasename(char *);
+#define dirname gitdirname
+extern char *gitdirname(char *);
 #endif
 
 #ifndef NO_ICONV
@@ -328,10 +330,6 @@ extern char *gitbasename(char *);
 #define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 #endif
 
-#ifndef STRIP_EXTENSION
-#define STRIP_EXTENSION ""
-#endif
-
 #ifndef has_dos_drive_prefix
 static inline int git_has_dos_drive_prefix(const char *path)
 {
@@ -340,6 +338,14 @@ static inline int git_has_dos_drive_prefix(const char *path)
 #define has_dos_drive_prefix git_has_dos_drive_prefix
 #endif
 
+#ifndef skip_dos_drive_prefix
+static inline int git_skip_dos_drive_prefix(char **path)
+{
+       return 0;
+}
+#define skip_dos_drive_prefix git_skip_dos_drive_prefix
+#endif
+
 #ifndef is_dir_sep
 static inline int git_is_dir_sep(int c)
 {
@@ -668,7 +674,6 @@ extern int git_vsnprintf(char *str, size_t maxsize,
 #ifdef __GLIBC_PREREQ
 #if __GLIBC_PREREQ(2, 1)
 #define HAVE_STRCHRNUL
-#define HAVE_MEMPCPY
 #endif
 #endif
 
@@ -682,14 +687,6 @@ static inline char *gitstrchrnul(const char *s, int c)
 }
 #endif
 
-#ifndef HAVE_MEMPCPY
-#define mempcpy gitmempcpy
-static inline void *gitmempcpy(void *dest, const void *src, size_t n)
-{
-       return (char *)memcpy(dest, src, n) + n;
-}
-#endif
-
 #ifdef NO_INET_PTON
 int inet_pton(int af, const char *src, void *dst);
 #endif
@@ -715,8 +712,8 @@ static inline size_t st_add(size_t a, size_t b)
                    (uintmax_t)a, (uintmax_t)b);
        return a + b;
 }
-#define st_add3(a,b,c)   st_add((a),st_add((b),(c)))
-#define st_add4(a,b,c,d) st_add((a),st_add3((b),(c),(d)))
+#define st_add3(a,b,c)   st_add(st_add((a),(b)),(c))
+#define st_add4(a,b,c,d) st_add(st_add3((a),(b),(c)),(d))
 
 static inline size_t st_mult(size_t a, size_t b)
 {
@@ -764,8 +761,72 @@ extern int xmkstemp_mode(char *template, int mode);
 extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 extern int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1);
 extern char *xgetcwd(void);
+extern FILE *fopen_for_writing(const char *path);
+
+#define ALLOC_ARRAY(x, alloc) (x) = xmalloc(st_mult(sizeof(*(x)), (alloc)))
+#define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), st_mult(sizeof(*(x)), (alloc)))
 
-#define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), (alloc) * sizeof(*(x)))
+/*
+ * These functions help you allocate structs with flex arrays, and copy
+ * the data directly into the array. For example, if you had:
+ *
+ *   struct foo {
+ *     int bar;
+ *     char name[FLEX_ARRAY];
+ *   };
+ *
+ * you can do:
+ *
+ *   struct foo *f;
+ *   FLEX_ALLOC_MEM(f, name, src, len);
+ *
+ * to allocate a "foo" with the contents of "src" in the "name" field.
+ * The resulting struct is automatically zero'd, and the flex-array field
+ * is NUL-terminated (whether the incoming src buffer was or not).
+ *
+ * The FLEXPTR_* variants operate on structs that don't use flex-arrays,
+ * but do want to store a pointer to some extra data in the same allocated
+ * block. For example, if you have:
+ *
+ *   struct foo {
+ *     char *name;
+ *     int bar;
+ *   };
+ *
+ * you can do:
+ *
+ *   struct foo *f;
+ *   FLEX_ALLOC_STR(f, name, src);
+ *
+ * and "name" will point to a block of memory after the struct, which will be
+ * freed along with the struct (but the pointer can be repointed anywhere).
+ *
+ * The *_STR variants accept a string parameter rather than a ptr/len
+ * combination.
+ *
+ * Note that these macros will evaluate the first parameter multiple
+ * times, and it must be assignable as an lvalue.
+ */
+#define FLEX_ALLOC_MEM(x, flexname, buf, len) do { \
+       (x) = NULL; /* silence -Wuninitialized for offset calculation */ \
+       (x) = xalloc_flex(sizeof(*(x)), (char *)(&((x)->flexname)) - (char *)(x), (buf), (len)); \
+} while (0)
+#define FLEXPTR_ALLOC_MEM(x, ptrname, buf, len) do { \
+       (x) = xalloc_flex(sizeof(*(x)), sizeof(*(x)), (buf), (len)); \
+       (x)->ptrname = (void *)((x)+1); \
+} while(0)
+#define FLEX_ALLOC_STR(x, flexname, str) \
+       FLEX_ALLOC_MEM((x), flexname, (str), strlen(str))
+#define FLEXPTR_ALLOC_STR(x, ptrname, str) \
+       FLEXPTR_ALLOC_MEM((x), ptrname, (str), strlen(str))
+
+static inline void *xalloc_flex(size_t base_len, size_t offset,
+                               const void *src, size_t src_len)
+{
+       unsigned char *ret = xcalloc(1, st_add3(base_len, src_len, 1));
+       memcpy(ret + offset, src, src_len);
+       return ret;
+}
 
 static inline char *xstrdup_or_null(const char *str)
 {
@@ -779,6 +840,9 @@ static inline size_t xsize_t(off_t len)
        return (size_t)len;
 }
 
+__attribute__((format (printf, 3, 4)))
+extern int xsnprintf(char *dst, size_t max, const char *fmt, ...);
+
 /* in ctype.c, for kwset users */
 extern const unsigned char tolower_trans_tbl[256];
 
@@ -849,6 +913,9 @@ static inline int strtoul_ui(char const *s, int base, unsigned int *result)
        char *p;
 
        errno = 0;
+       /* negative values would be accepted by strtoul */
+       if (strchr(s, '-'))
+               return -1;
        ul = strtoul(s, &p, base);
        if (errno || *p || p == s || (unsigned int) ul != ul)
                return -1;
@@ -976,3 +1043,5 @@ struct tm *git_gmtime_r(const time_t *, struct tm *);
 #endif
 
 #endif
+
+extern int cmd_main(int, const char **);