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129 #include <stddef.h>
130
131 void write_all(int fd, char const *buf, size_t len);
132 size_t read_all(int fd, unsigned char *buf, size_t len);
133 void write_str(int fd, char const *s);
134 void newline(int fd);
135 void write_line(int fd, char const *s);
136 #define assert(expr) ((void) ((expr) || (assert_fail(#expr), 0)))
137 void assert_fail(char const *expr);
138 void perr(char const *context);
139 int chkp(char const *context, int ret);