diff options
Diffstat (limited to 'src/libString/s_read.c')
-rw-r--r-- | src/libString/s_read.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/src/libString/s_read.c b/src/libString/s_read.c new file mode 100644 index 00000000..59581eaf --- /dev/null +++ b/src/libString/s_read.c @@ -0,0 +1,38 @@ +#include <u.h> +#include <libc.h> +#include <bio.h> +#include "libString.h" + +enum +{ + Minread= 256, +}; + +/* Append up to 'len' input bytes to the string 'to'. + * + * Returns the number of characters read. + */ +extern int +s_read(Biobuf *fp, String *to, int len) +{ + int rv; + int n; + + if(to->ref > 1) + sysfatal("can't s_read a shared string"); + for(rv = 0; rv < len; rv += n){ + n = to->end - to->ptr; + if(n < Minread){ + s_grow(to, Minread); + n = to->end - to->ptr; + } + if(n > len - rv) + n = len - rv; + n = Bread(fp, to->ptr, n); + if(n <= 0) + break; + to->ptr += n; + } + s_terminate(to); + return rv; +} |