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Fix gcc8 error/warning -Werror=format-truncation= #787

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Aug 1, 2018
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Fix gcc8 error/warning -Werror=format-truncation= #787

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7 changes: 4 additions & 3 deletions Release/src/utilities/asyncrt_utils.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -691,12 +691,13 @@ utility::string_t datetime::to_string(date_format format) const
{
// Append fractional second, which is a 7-digit value with no trailing zeros
// This way, '1200' becomes '00012'
char buf[9] = { 0 };
const int max_frac_length = 8;
char buf[max_frac_length+1] = { 0 };
snprintf(buf, sizeof(buf), ".%07ld", (long int)frac_sec);
// trim trailing zeros
for (int i = 7; buf[i] == '0'; i--) buf[i] = '\0';
for (int i = max_frac_length-1; buf[i] == '0'; i--) buf[i] = '\0';
// format the datetime into a separate buffer
char datetime_str[max_dt_length+1] = {0};
char datetime_str[max_dt_length-max_frac_length-1+1] = {0};
strftime(datetime_str, sizeof(datetime_str), "%Y-%m-%dT%H:%M:%S", &datetime);
// now print this buffer into the output buffer
snprintf(output, sizeof(output), "%s%sZ", datetime_str, buf);
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