diff options
Diffstat (limited to '')
| -rw-r--r-- | common.h | 66 |
1 files changed, 62 insertions, 4 deletions
@@ -378,9 +378,33 @@ LIBRECRYPT_NONNULL_1__ LIBRECRYPT_WUR__ HIDDEN struct pepper *librecrypt_get_pepper_(LIBRECRYPT_CONTEXT *ctx, enum librecrypt_hash_algorithm algo, size_t len); +/** + * Create a gap in a buffer to write data to + * + * @param state The buffer to modify, see `struct concat_state` for more information + * @param len The desired gap size + * @return The number of bytes available to write to; will be at most `len` + * + * The function will compare `len` against the remaining + * buffer size and return how much of that is available + * for writing to. At the same time, buffer position and + * remainging size is update as if that much data was + * written, `state->len` in increased by `len`, and the + * buffer is NUL terminated. The caller must retrieve + * the current buffer position, `state->buf` _before_ calling + * this function, so that it knows where the write data to. + * + * Example: + * void copy(struct concat_state *state, const char *text, size_t len) + * { + * char *buf = state->buf; + * size_t n = librecrypt_concat_void_(state, len); + * if (n) memcpy(buf, text, n); + * } + */ LIBRECRYPT_NONNULL_1__ LIBRECRYPT_WUR__ HIDDEN inline size_t -librecrypt_concat_void_(struct concat_state *state, size_t len) /* TODO doc */ +librecrypt_concat_void_(struct concat_state *state, size_t len) { size_t n = state->size ? MIN(state->size - 1u, len) : 0u; if (len > SIZE_MAX - state->len) @@ -396,9 +420,20 @@ librecrypt_concat_void_(struct concat_state *state, size_t len) /* TODO doc */ } +/** + * Concatenate two strings + * + * Truncation is done to ensure the resulting string + * does not overrun it's buffer but is still NUL + * terminated (assuming the buffer is not zero-sized) + * + * @param state The buffer to write to, see `struct concat_state` for more information + * @param text The text to copy to the buffer + * @param len The length of `text`, in bytes + */ LIBRECRYPT_NONNULL_1__ LIBRECRYPT_READ_MEM__(2, 3) HIDDEN inline void -librecrypt_concat_mem_(struct concat_state *state, const char *text, size_t len) /* TODO doc */ +librecrypt_concat_mem_(struct concat_state *state, const char *text, size_t len) { char *buf = state->buf; size_t n = librecrypt_concat_void_(state, len); @@ -407,16 +442,39 @@ librecrypt_concat_mem_(struct concat_state *state, const char *text, size_t len) } +/** + * Concatenate two strings + * + * Truncation is done to ensure the resulting string + * does not overrun it's buffer but is still NUL + * terminated (assuming the buffer is not zero-sized) + * + * @param state The buffer to write to, see `struct concat_state` for more information + * @param text The text to copy to the buffer + */ LIBRECRYPT_NONNULL_1__ LIBRECRYPT_READ_STR__(2) HIDDEN inline void -librecrypt_concat_str_(struct concat_state *state, const char *text) /* TODO doc */ +librecrypt_concat_str_(struct concat_state *state, const char *text) { librecrypt_concat_mem_(state, text, strlen(text)); } +/** + * Concatenate an unsigned integer onto a string + * + * The integer will be formated in decimal without + * redundant noughts + * + * Truncation is done to ensure the resulting string + * does not overrun it's buffer but is still NUL + * terminated (assuming the buffer is not zero-sized) + * + * @param state The buffer to write to, see `struct concat_state` for more information + * @param value The integer to write to the buffer + */ LIBRECRYPT_NONNULL_1__ HIDDEN -void librecrypt_concat_uint_(struct concat_state *state, uintmax_t value); /* TODO doc */ +void librecrypt_concat_uint_(struct concat_state *state, uintmax_t value); |