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Clean up next_line() interface and implementation

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ridiculousfish 2019-08-11 12:56:51 -07:00
parent 91987a4548
commit 2ddde381d4
1 changed files with 9 additions and 11 deletions
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20
src/history_file.cpp
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@ -309,26 +309,24 @@ static bool parse_timestamp(const char *str, time_t *out_when) {
/// Returns a pointer to the start of the next line, or NULL. The next line must itself end with a /// Returns a pointer to the start of the next line, or NULL. The next line must itself end with a
/// newline. Note that the string is not null terminated. /// newline. Note that the string is not null terminated.
static const char *next_line(const char *start, size_t length) { static const char *next_line(const char *start, const char *end) {
// Handle the hopeless case. // Handle the hopeless case.
if (length < 1) return NULL; if (end == start) return NULL;
// Get a pointer to the end, that we must not pass.
const char *const end = start + length;
// Skip past the next newline. // Skip past the next newline.
const char *nextline = (const char *)std::memchr(start, '\n', length); const char *nextline = std::find(start, end, '\n');
if (!nextline || nextline >= end) { if (nextline == end) {
return NULL; return NULL;
} }
// Skip past the newline character itself. // Skip past the newline character itself.
if (++nextline >= end) { if (++nextline >= end) {
return NULL; return NULL;
} }
// Make sure this new line is itself "newline terminated". If it's not, return NULL. // Make sure this new line is itself "newline terminated". If it's not, return NULL.
const char *next_newline = (const char *)std::memchr(nextline, '\n', end - nextline); const char *next_newline = std::find(nextline, end, '\n');
if (!next_newline) { if (next_newline == end) {
return NULL; return NULL;
} }
@ -401,9 +399,9 @@ static size_t offset_of_next_item_fish_2_0(const history_file_contents_t &conten
time_t timestamp = 0; time_t timestamp = 0;
const char *interior_line; const char *interior_line;
for (interior_line = next_line(line_start, end - line_start); for (interior_line = next_line(line_start, end);
interior_line != NULL && !has_timestamp; interior_line != NULL && !has_timestamp;
interior_line = next_line(interior_line, end - interior_line)) { interior_line = next_line(interior_line, end)) {
// If the first character is not a space, it's not an interior line, so we're done. // If the first character is not a space, it's not an interior line, so we're done.
if (interior_line[0] != ' ') break; if (interior_line[0] != ' ') break;