Add readfile function.

1 files changed, 581 insertions, 516 deletions

diff --git a/doc/gawk.info b/doc/gawk.info
index 9072bf06..0bbf9dde 100644
--- a/doc/gawk.info
+++ b/doc/gawk.info
@@ -401,6 +401,8 @@ texts being (a) (see below), and with the Back-Cover Texts being (b)
 * Join Function::                       A function to join an array into a
                                         string.
 * Getlocaltime Function::               A function to get formatted times.
+* Readfile Function::                   A function to read an entire file at
+                                        once.
 * Data File Management::                Functions for managing command-line
                                         data files.
 * Filetrans Function::                  A function for handling data file
@@ -13663,6 +13665,7 @@ programming use.
                                 vice versa.
 * Join Function::               A function to join an array into a string.
 * Getlocaltime Function::       A function to get formatted times.
+* Readfile Function::           A function to read an entire file at once.
 
 
 File: gawk.info,  Node: Strtonum Function,  Next: Assert Function,  Up: General Functions
@@ -14055,7 +14058,7 @@ concatenation.  The lack of an explicit operator for concatenation
 makes string operations more difficult than they really need to be.
 
 
-File: gawk.info,  Node: Getlocaltime Function,  Prev: Join Function,  Up: General Functions
+File: gawk.info,  Node: Getlocaltime Function,  Next: Readfile Function,  Prev: Join Function,  Up: General Functions
 
 10.2.7 Managing the Time of Day
 -------------------------------
@@ -14137,6 +14140,66 @@ the `getlocaltime()' function would have allowed the user to supply an
 optional timestamp value to use instead of the current time.
 
 
+File: gawk.info,  Node: Readfile Function,  Prev: Getlocaltime Function,  Up: General Functions
+
+10.2.8 Reading A Whole File At Once
+-----------------------------------
+
+Often, it is convenient to have the entire contents of a file available
+in memory as a single string. A straightforward but naive way to do
+that might be as follows:
+
+     function readfile(file,    tmp, contents)
+     {
+         if ((getline tmp < file) < 0)
+             return
+
+         contents = tmp
+         while (getline tmp < file) > 0)
+             contents = contents RT tmp
+
+         close(file)
+         return contents
+     }
+
+   This function reads from `file' one record at a time, building up
+the full contents of the file in the local variable `contents'.  It
+works, but is not necessarily efficient.
+
+   The following function, based on a suggestion by Denis Shirokov,
+reads the entire contents of the named file in one shot:
+
+     # readfile.awk --- read an entire file at once
+
+     function readfile(file,     tmp, save_rs)
+     {
+         save_rs = RS
+         RS = "^$"
+         getline tmp < file
+         close(file)
+         RS = save_rs
+
+         return tmp
+     }
+
+   It works by setting `RS' to `^$', a regular expression that will
+never match if the file has contents.  `gawk' reads data from the file
+into `tmp' attempting to match `RS'.  The match fails after each read,
+but fails quickly, such that `gawk' fills `tmp' with the entire
+contents of the file.  (*Note Records::, for information on `RT' and
+`RS'.)
+
+   In the case that `file' is empty, the return value is the null
+string.  Thus calling code may use something like:
+
+     contents = readfile("/some/path")
+     if (length(contents) == 0)
+         # file was empty ...
+
+   This tests the result to see if it is empty or not. An equivalent
+test would be `contents == ""'.
+
+
 File: gawk.info,  Node: Data File Management,  Next: Getopt Function,  Prev: General Functions,  Up: Library Functions
 
 10.3 Data File Management
@@ -31492,6 +31555,7 @@ Index
                                                               (line   9)
 * readfile extension function:           Extension Sample Readfile.
                                                               (line  11)
+* readfile() user-defined function:      Readfile Function.   (line  30)
 * recipe for a programming language:     History.             (line   6)
 * record separators <1>:                 User-modified.       (line 143)
 * record separators:                     Records.             (line  14)
@@ -32087,520 +32151,521 @@ Index
 
 Tag Table:
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 End Tag Table