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system_data_types.7: Minor tweaks to Alejandro Colomar's patch 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2020-09-21 16:08:18 +02:00
parent f5d2c2efb2
commit 89c6c2bdd2
1 changed files with 15 additions and 10 deletions
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25
man7/system_data_types.7
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@ -660,8 +660,8 @@ The program shown below scans from a string and prints a value stored in
a variable of an integer type that doesn't have a length modifier.
The appropriate conversions from and to
.IR intmax_t ,
and the appropriate range checkings,
are used as explained in the notes section above:
and the appropriate range checks,
are used as explained in the notes section above.
.PP
.EX
#include <stdint.h>
@ -669,7 +669,6 @@ are used as explained in the notes section above:
#include <stdlib.h>
#include <sys/types.h>
int
main (void)
{
@ -678,26 +677,32 @@ main (void)
intmax_t tmp;
/* Scan the number from the string into the temporary variable */
sscanf(str, "%jd", &tmp);
/* Check that the value is within the valid range of suseconds_t */
if (tmp < -1 || tmp > 1000000) {
fprintf(stderr, "Scaned value might overflow!\en");
if (tmp < \-1 || tmp > 1000000) {
fprintf(stderr, "Scanned value outside valid range!\en");
exit(EXIT_FAILURE);
}
/* Copy the value to the suseconds_t variable 'us' */
/* Copy the value to the suseconds_t variable \(aqus\(aq */
us = tmp;
/* Even though suseconds_t can hold the value -1,
it represents an error code */
/* Even though suseconds_t can hold the value \-1, this isn\(aqt
a sensible number of microseconds */
if (us < 0) {
fprintf(stderr, "Scanned an error code!\en");
fprintf(stderr, "Scanned value shouldn\(aqt be negative!\en");
exit(EXIT_FAILURE);
}
/* Print the value */
printf("There are %jd us in half a second.\en", (intmax_t) us);
printf("There are %jd microseconds in half a second.\en",
(intmax_t) us);
exit(EXIT_SUCCESS);
}