| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | #include <errno.h> | ||
| 2 | #include <limits.h> | ||
| 3 | #include <stdarg.h> | ||
| 4 | #include <stdio.h> | ||
| 5 | #include <stdlib.h> | ||
| 6 | #include "xmalloc.h" | ||
| 7 | #include "debug.h" | ||
| 8 | #include "xsnprintf.h" | ||
| 9 | |||
| 10 | 72880 | static void *check_alloc(void *alloc) | |
| 11 | { | ||
| 12 |
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72880 | if (unlikely(alloc == NULL)) { |
| 13 | − | fatal_error(__func__, ENOMEM); | |
| 14 | } | ||
| 15 | 72880 | return alloc; | |
| 16 | } | ||
| 17 | |||
| 18 | 16987 | size_t xmul_(size_t a, size_t b) | |
| 19 | { | ||
| 20 | 16987 | size_t result; | |
| 21 |
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16987 | if (unlikely(size_multiply_overflows(a, b, &result))) { |
| 22 | − | fatal_error(__func__, EOVERFLOW); | |
| 23 | } | ||
| 24 | 16987 | return result; | |
| 25 | } | ||
| 26 | |||
| 27 | 196129 | size_t xadd(size_t a, size_t b) | |
| 28 | { | ||
| 29 | 196129 | size_t result; | |
| 30 |
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196129 | if (unlikely(size_add_overflows(a, b, &result))) { |
| 31 | − | fatal_error(__func__, EOVERFLOW); | |
| 32 | } | ||
| 33 | 196129 | return result; | |
| 34 | } | ||
| 35 | |||
| 36 | // Like malloc(3), but calling fatal_error() on OOM and forbidding | ||
| 37 | // zero-sized allocations (thus never returning NULL) | ||
| 38 | 42100 | void *xmalloc(size_t size) | |
| 39 | { | ||
| 40 | 42100 | BUG_ON(size == 0); | |
| 41 | 42100 | return check_alloc(malloc(size)); | |
| 42 | } | ||
| 43 | |||
| 44 | 3706 | void *xcalloc(size_t nmemb, size_t size) | |
| 45 | { | ||
| 46 | 3706 | if (__STDC_VERSION__ < 202311L) { | |
| 47 | // ISO C23 (ยง7.24.3.2) requires calloc() to check for integer | ||
| 48 | // overflow in `nmemb * size`, but older C standards don't | ||
| 49 | 3706 | xmul(nmemb, size); | |
| 50 | } | ||
| 51 | |||
| 52 | 3706 | BUG_ON(nmemb == 0 || size == 0); | |
| 53 | 3706 | return check_alloc(calloc(nmemb, size)); | |
| 54 | } | ||
| 55 | |||
| 56 | 11527 | void *xrealloc(void *ptr, size_t size) | |
| 57 | { | ||
| 58 | 11527 | BUG_ON(size == 0); | |
| 59 | 11527 | return check_alloc(realloc(ptr, size)); | |
| 60 | } | ||
| 61 | |||
| 62 | 15547 | char *xstrdup(const char *str) | |
| 63 | { | ||
| 64 | 15547 | return check_alloc(strdup(str)); | |
| 65 | } | ||
| 66 | |||
| 67 | VPRINTF(1) | ||
| 68 | 2 | static char *xvasprintf(const char *format, va_list ap) | |
| 69 | { | ||
| 70 | 2 | va_list ap2; | |
| 71 | 2 | va_copy(ap2, ap); | |
| 72 | 2 | int n = vsnprintf(NULL, 0, format, ap2); | |
| 73 | 2 | va_end(ap2); | |
| 74 | |||
| 75 |
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2 | if (unlikely(n < 0 || n == INT_MAX)) { |
| 76 | − | fatal_error(__func__, n < 0 ? errno : EOVERFLOW); | |
| 77 | } | ||
| 78 | |||
| 79 | 2 | char *str = xmalloc(n + 1); | |
| 80 | 2 | size_t m = xvsnprintf(str, n + 1, format, ap); | |
| 81 | 2 | BUG_ON(m != n); | |
| 82 | 2 | return str; | |
| 83 | } | ||
| 84 | |||
| 85 | 2 | char *xasprintf(const char *format, ...) | |
| 86 | { | ||
| 87 | 2 | va_list ap; | |
| 88 | 2 | va_start(ap, format); | |
| 89 | 2 | char *str = xvasprintf(format, ap); | |
| 90 | 2 | va_end(ap); | |
| 91 | 2 | return str; | |
| 92 | } | ||
| 93 |