116 lines
2.6 KiB
C
116 lines
2.6 KiB
C
#ifndef FORTIFY_STDIO_H_
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#define FORTIFY_STDIO_H_
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#include_next <stdio.h>
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#if defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0 && defined(__OPTIMIZE__) && __OPTIMIZE__ > 0
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static inline __attribute__ ((always_inline))
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char *
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__fortify_fgets(char *s, int n, FILE *fp)
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{
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size_t bos = __builtin_object_size(s, 0);
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if ((size_t)n > bos)
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__builtin_trap();
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return fgets(s, n, fp);
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}
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static inline __attribute__ ((always_inline))
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size_t
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__fortify_fread(void *dst, size_t n, size_t nmemb, FILE *fp)
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{
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size_t bos = __builtin_object_size(dst, 0);
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if (n != 0 && (n * nmemb) / n != nmemb)
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__builtin_trap();
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if (n * nmemb > bos)
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__builtin_trap();
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return fread(dst, n, nmemb, fp);
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}
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static inline __attribute__ ((always_inline))
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size_t
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__fortify_fwrite(const void *dst, size_t n, size_t nmemb, FILE *fp)
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{
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size_t bos = __builtin_object_size(dst, 0);
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if (n != 0 && (n * nmemb) / n != nmemb)
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__builtin_trap();
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if (n * nmemb > bos)
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__builtin_trap();
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return fwrite(dst, n, nmemb, fp);
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}
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static inline
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__attribute__ ((always_inline))
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__attribute__ ((__format__ (printf, 2, 0)))
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__attribute__ ((__nonnull__ (2)))
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int
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__fortify_vsprintf(char *s, const char *fmt, __builtin_va_list ap)
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{
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size_t bos = __builtin_object_size(s, 0);
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int r;
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if (bos != -1) {
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r = vsnprintf(s, bos, fmt, ap);
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if (r != -1 && (size_t)r >= bos)
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__builtin_trap();
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} else {
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r = vsprintf(s, fmt, ap);
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}
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return r;
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}
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static inline
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__attribute__ ((always_inline))
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__attribute__ ((__format__ (printf, 3, 0)))
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__attribute__ ((__nonnull__ (3)))
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int
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__fortify_vsnprintf(char *s, size_t n, const char *fmt, __builtin_va_list ap)
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{
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size_t bos = __builtin_object_size(s, 0);
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if (n > bos)
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__builtin_trap();
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return vsnprintf(s, n, fmt, ap);
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}
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#undef fgets
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#define fgets(s, n, fp) __fortify_fgets(s, n, fp)
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#undef fread
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#define fread(dst, n, nmemb, fp) __fortify_fread(dst, n, nmemb, fp)
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#undef fwrite
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#define fwrite(dst, n, nmemb, fp) __fortify_fwrite(dst, n, nmemb, fp)
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#undef vsprintf
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#define vsprintf(s, fmt, ap) __fortify_vsprintf(s, fmt, ap)
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#undef vsnprintf
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#define vsnprintf(s, n, fmt, ap) __fortify_vsnprintf(s, n, fmt, ap)
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#undef snprintf
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#define snprintf(s, n, fmt, ...) ({ \
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size_t _n = n; \
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size_t bos = __builtin_object_size(s, 0); \
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if (_n > bos) \
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__builtin_trap(); \
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(snprintf)(s, _n, fmt, ## __VA_ARGS__); \
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})
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#undef sprintf
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#define sprintf(s, fmt, ...) ({ \
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size_t bos = __builtin_object_size(s, 0); \
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int r; \
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if (bos != -1) { \
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r = (snprintf)(s, bos, fmt, ## __VA_ARGS__); \
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if (r != -1 && (size_t)r >= bos) \
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__builtin_trap(); \
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} else { \
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r = (sprintf)(s, fmt, ## __VA_ARGS__); \
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} \
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r; \
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})
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#endif
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#endif
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