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work without libio

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This commit is contained in:
dtb 2023-09-14 09:47:24 -04:00
parent 4161fad929
commit 054063f2f3
2 changed files with 8 additions and 16 deletions
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10
retval/Makefile
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@ -1,8 +1,2 @@
retval: retval.o ../libio/libio.o
$(CC) -o retval ../libio/libio.o retval.o
retval.o: retval.c ../libio/libio.h
$(CC) -c -I../libio -o retval.o retval.c
../libio/libio.o: ../libio/libio.c ../libio/libio.h
$(MAKE) -C ../libio
retval: retval.c
$(CC) -o retval retval.c

14
retval/retval.c
View File

@ -1,8 +1,7 @@
#include <ctype.h> /* isdigit(3) */
#include <errno.h> /* errno */
#include <stdio.h> /* fprintf(3), stderr */
#include <stdlib.h> /* strtol(3) */
#include <sysexits.h> /* EX_USAGE */
#include <unistd.h> /* write(2) */
#include "libio.h" /* fdprint(3), parse_uint(3) */
static char *program_name = "retval";
@ -14,11 +13,10 @@ usage: fprintf(stderr, "Usage: %s [status]\n", argv[0] == NULL ? program_name :
return EX_USAGE;
}
for(s = 0; argv[1][s] != '\0'; ++s)
if(!isdigit(argv[1][s]))
goto usage;
s = parse_uint(argv[1]);
errno = 0;
s = strtol(argv[1], &argv[1], 10);
if(*argv[1] != '\0' || errno != 0)
goto usage;
return s;
}