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Full Discussion: Shell script code not really understandable for me
Top Forums Shell Programming and Scripting Shell script code not really understandable for me Post 302995398 by Corona688 on Wednesday 5th of April 2017 11:32:10 AM
Old 04-05-2017
I think you left out an important part of the script. There must be a "shift" somewhere below that "esac", which will change the value of $1.

When $1="A", $2="B", $3="C", shift tosses the value of $1 then sets $1="B", $2="C".

If you give shift a value, like shift 2, it deletes n leading arguments, not just one.

In this manner you can loop through all arguments while just checking $1.

I don't like the way they do the loop, though. Just because an argument is blank doesn't mean its the last argument, what if it's supposed to be blank for some reason?
This User Gave Thanks to Corona688 For This Post:
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LEARN ABOUT SUNOS

mlib_vectormulshift_s16c_sat

mlib_VectorMulShift_U8_Mod(3MLIB)			    mediaLib Library Functions				 mlib_VectorMulShift_U8_Mod(3MLIB)

NAME

       mlib_VectorMulShift_U8_Mod,    mlib_VectorMulShift_U8_Sat,    mlib_VectorMulShift_U8C_Mod,   mlib_VectorMulShift_U8C_Sat,   mlib_VectorMul-
       Shift_S8_Mod, mlib_VectorMulShift_S8_Sat, mlib_VectorMulShift_S8C_Mod, mlib_VectorMulShift_S8C_Sat, mlib_VectorMulShift_S16_Mod,  mlib_Vec-
       torMulShift_S16_Sat,  mlib_VectorMulShift_S16C_Mod, mlib_VectorMulShift_S16C_Sat, mlib_VectorMulShift_S32_Mod, mlib_VectorMulShift_S32_Sat,
       mlib_VectorMulShift_S32C_Mod, mlib_VectorMulShift_S32C_Sat - vector multiplication with shifting, in place

SYNOPSIS

       cc [ flag... ] file... -lmlib [ library... ]
       #include <mlib.h>

       mlib_status mlib_VectorMulShift_U8_Mod(mlib_u8 *xz, const mlib_u8 *y, mlib_s32 n, mlib_s32 shift);

       mlib_status mlib_VectorMulShift_U8_Sat(mlib_u8 *xz, const mlib_u8 *y, mlib_s32 n, mlib_s32 shift);

       mlib_status mlib_VectorMulShift_U8C_Mod(mlib_u8 *xz, const mlib_u8 *y, mlib_s32 n, mlib_s32 shift);

       mlib_status mlib_VectorMulShift_U8C_Sat(mlib_u8 *xz, const mlib_u8 *y, mlib_s32 n, mlib_s32 shift);

       mlib_status mlib_VectorMulShift_S8_Mod(mlib_s8 *xz, const mlib_s8 *y, mlib_s32 n, mlib_s32 shift);

       mlib_status mlib_VectorMulShift_S8_Sat(mlib_s8 *xz, const mlib_s8 *y, mlib_s32 n, mlib_s32 shift);

       mlib_status mlib_VectorMulShift_S8C_Mod(mlib_s8 *xz, const mlib_s8 *y, mlib_s32 n, mlib_s32 shift);

       mlib_status mlib_VectorMulShift_S8C_Sat(mlib_s8 *xz, const mlib_s8 *y, mlib_s32 n, mlib_s32 shift);

       mlib_status mlib_VectorMulShift_S16_Mod(mlib_s16 *xz, const mlib_s16 *y, mlib_s32 n, mlib_s32 shift);

       mlib_status mlib_VectorMulShift_S16_Sat(mlib_s16 *xz, const mlib_s16 *y, mlib_s32 n, mlib_s32 shift);

       mlib_status mlib_VectorMulShift_S16C_Mod(mlib_s16 *xz, const mlib_s16 *y, mlib_s32 n, mlib_s32 shift);

       mlib_status mlib_VectorMulShift_S16C_Sat(mlib_s16 *xz, const mlib_s16 *y, mlib_s32 n, mlib_s32 shift);

       mlib_status mlib_VectorMulShift_S32_Mod(mlib_s32 *xz, const mlib_s32 *y, mlib_s32 n, mlib_s32 shift);

       mlib_status mlib_VectorMulShift_S32_Sat(mlib_s32 *xz, const mlib_s32 *y, mlib_s32 n, mlib_s32 shift);

       mlib_status mlib_VectorMulShift_S32C_Mod(mlib_s32 *xz, const mlib_s32 *y, mlib_s32 n, mlib_s32 shift);

       mlib_status mlib_VectorMulShift_S32C_Sat(mlib_s32 *xz, const mlib_s32 *y, mlib_s32 n, mlib_s32 shift);

DESCRIPTION

       Each of these functions performs an in-place multiplication of two vectors and shifts the result.

       For real data, the following equation is used:

       xz[i] = xz[i] * y[i] * 2**(-shift)

       where i = 0, 1, ..., (n - 1).

       For complex data, the following equation is used:

       tmp	   = xz[2*i]
       xz[2*i]	   = (tmp*y[2*i] - xz[2*i + 1]*y[2*i + 1]) * 2**(-shift)
       xz[2*i + 1] = (tmp*y[2*i + 1] + xz[2*i + 1]*y[2*i]) * 2**(-shift)

       where i = 0, 1, ..., (n - 1).

PARAMETERS

       Each of the functions takes the following arguments:

       xz	       Pointer to the first element of the first source and result vector.

       y	       Pointer to the first element of the second source vector.

       n	       Number of elements in each vector.

       shift	       Right shifting factor.  The ranges of valid shift are:

		       1 <= shift <= 8	 for U8, S8, U8C, S8C types
		       1 <= shift <= 16  for S16, S16C types
		       1 <= shift <= 31  for S32, S32C types

RETURN VALUES

       Each of the functions returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       mlib_VectorMulShift_U8_U8_Mod(3MLIB), attributes(5)

SunOS 5.10							    10 Nov 2004 				 mlib_VectorMulShift_U8_Mod(3MLIB)
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