diff options
Diffstat (limited to 'git-compat-util.h')
| -rw-r--r-- | git-compat-util.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/git-compat-util.h b/git-compat-util.h index fe845ae63..2af8d3edb 100644 --- a/git-compat-util.h +++ b/git-compat-util.h @@ -28,6 +28,18 @@ #define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0])) #define bitsizeof(x) (CHAR_BIT * sizeof(x)) +#define maximum_signed_value_of_type(a) \ + (INTMAX_MAX >> (bitsizeof(intmax_t) - bitsizeof(a))) + +/* + * Signed integer overflow is undefined in C, so here's a helper macro + * to detect if the sum of two integers will overflow. + * + * Requires: a >= 0, typeof(a) equals typeof(b) + */ +#define signed_add_overflows(a, b) \ + ((b) > maximum_signed_value_of_type(a) - (a)) + #ifdef __GNUC__ #define TYPEOF(x) (__typeof__(x)) #else @@ -160,6 +172,10 @@ extern char *gitbasename(char *); #define PRIx32 "x" #endif +#ifndef PRIo32 +#define PRIo32 "o" +#endif + #ifndef PATH_SEP #define PATH_SEP ':' #endif @@ -312,6 +328,11 @@ extern size_t gitstrlcpy(char *, const char *, size_t); extern uintmax_t gitstrtoumax(const char *, char **, int); #endif +#ifdef NO_STRTOK_R +#define strtok_r gitstrtok_r +extern char *gitstrtok_r(char *s, const char *delim, char **save_ptr); +#endif + #ifdef NO_HSTRERROR #define hstrerror githstrerror extern const char *githstrerror(int herror); |