1 files changed, 65 insertions, 0 deletions
diff --git a/stdin.c b/stdin.c
new file mode 100644
index 0000000..3d2c54a
--- /dev/null
+++ b/stdin.c
@@ -0,0 +1,65 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "main.h"
+
+void stdinMode(char *buffer, int wrap, bool decode, char argv[])
+{
+//wrap encoded lines after COLS character (default 76).
+int size = DEFAULT_SIZE-1;
+
+int i = 0;//position in string
+moreInput: while (i < size)
+	{
+	//yes, reading one byte at a time is slow; but you shouldn't be dumping a file into stdin anyway.
+	if (!(fread(buffer+i, 1, 1*sizeof(unsigned char), stdin))){goto process;}//Goes to process if EOF or if fread fails
+	++i;//increment i so preiously read char isn't overwritten.
+	}
+//realloc if input could have exceeded buffer
+size += DEFAULT_SIZE;
+buffer = realloc(buffer,size*sizeof(unsigned char));
+if (!buffer){fprintf(stderr,"Realloc Failed!\n"); exit(1);}
+goto moreInput;
+
+process:;
+buffer[i] = '\0';//add null char since function expects it
+
+int result;
+
+if (!decode)
+	{
+	char *output = base64Encode(buffer, i);
+	if (!output){fprintf(stderr, "Malloc Failed!\n"); exit(1);}
+	if (wrap == 0){result = fwrite(output, 1, sizeof(unsigned char)*strlen(output), stdout); goto leave;}//if wrap is set to 0, do no wrapping.
+
+	int charactersLeft = strlen(output);//the total number of characters to print is strlen(output_
+	int x = 0;//position to print from in string so wrap printing works
+
+	while (charactersLeft > wrap)//keep looping until all of the wrap length writes are done
+		{
+		result = fwrite(output+x, 1, sizeof(unsigned char)*wrap, stdout);//write wrap number of characters at a time
+		if (!result){fprintf(stderr, "Fwrite Failed!\n"); exit(1);}//fwrite to stdout should not fail. It's best to just exit if it does.
+		putchar('\n');//add a newline to finish off the wrapped line
+		x += wrap;//increase the printing position to the next position
+		charactersLeft -= wrap;//decrease charactersLeft by how many were printed
+		}
+
+	if (charactersLeft == 0){goto leave;}//if the printed number of characters was perfect, don't print an extra newline
+
+	result = fwrite(output+x, 1, sizeof(unsigned char)*charactersLeft, stdout);//print any remaining characters that are smaller in number than wrap.
+	if (!result){fprintf(stderr, "Fwrite Failed!\n"); exit(1);}//fwrite to stdout should not fail. It's best to just exit if it does.
+	putchar('\n');//add a newline to finish off the wrapped line
+	goto leave;
+	}
+
+if (decode)
+	{
+	int outputLength = base64Decode(buffer, i);
+	if (outputLength == -1){fprintf(stderr,"%s: invalid input\n", argv); free(buffer); exit(1);}//base64 returns -1 if input string was invalid
+	result = fwrite(buffer, 1, sizeof(unsigned char)*outputLength, stdout);
+	goto leave;
+	}
+
+leave: free(buffer);
+exit(0);
+}