tadd readn to avoid need for plan9port libc - plan9port - [fork] Plan 9 from user space
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       ---
 (DIR) commit 2b9172c7d4f8f3f773946e1aab4f9376f50b4cf7
 (DIR) parent 93f2ae0d92e0ed88fef8265194024606b78d58c6
 (HTM) Author: rsc <devnull@localhost>
       Date:   Mon, 27 Dec 2004 00:36:40 +0000
       
       add readn to avoid need for plan9port libc
       
       Diffstat:
         M src/cmd/mk/archive.c                |      19 +++++++++++++++++++
         M src/cmd/mk/sys.h                    |       1 +
       
       2 files changed, 20 insertions(+), 0 deletions(-)
       ---
 (DIR) diff --git a/src/cmd/mk/archive.c b/src/cmd/mk/archive.c
       t@@ -23,6 +23,25 @@ static void atimes(char *);
        static char *split(char*, char**);
        
        long
       +readn(int f, void *av, long n)
       +{
       +        char *a;
       +        long m, t;
       +
       +        a = av;
       +        t = 0;
       +        while(t < n){
       +                m = read(f, a+t, n-t);
       +                if(m <= 0){
       +                        if(t == 0)
       +                                return m;
       +                        break;
       +                }
       +                t += m;
       +        }
       +        return t;
       +}
       +long
        atimeof(int force, char *name)
        {
                Symtab *sym;
 (DIR) diff --git a/src/cmd/mk/sys.h b/src/cmd/mk/sys.h
       t@@ -2,3 +2,4 @@
        #include <libc.h>
        #include <bio.h>
        #include <regexp.h>
       +