Added a mostly SUS-compliant echo.

README

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+    The mp-utils package includes a set of portable Unix utilities written by
+    me, Mid Favila. They attempt to comply with both the latest POSIX and SUS
+    specifications, whilst also implementing de facto standards such as sed's
+    -i option. The only time POSIX and SUS will not be obeyed is when doing
+    so requires relatively useless features to be implemented (that, or they
+    will be #ifdef'd).
+
+    They can be thought of as sitting somewhere between the Suckless tools and
+    Busybox - more sophisticated than Suckless' offerings, and less bloated
+    than Busybox.
+
+    I recommend compiling these statically.

README.md

@@ -1,3 +0,0 @@
-# mp-utils
-
-Mid's Portable Utilities are a set of (hopefully) POSIX and SUS-compliant Unix userland tools that are portable across many Unices.

src/common.h

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+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>

src/echo.c

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+#include "common.h"
+
+int main(int argc, char **argv)
+    {
+    int i, i2;
+    char escape = 0;
+
+    if(argc > 1)
+	for(i = 1; i < argc; i++)
+	    {
+	    for(i2 = 0; argv[i][i2] != '\0'; i2++)
+		{
+		if(escape)
+		    switch(argv[i][i2])
+			{
+			case 'a':
+			    escape = 0;
+			    putchar('\a');
+			    break;
+			case 'b':
+			    escape = 0;
+			    putchar('\b');
+			    break;
+			case 'c': // Immediately stop execution.
+			    goto end;
+			case 'f':
+			    escape = 0;
+			    putchar('\f');
+			    break;
+			case 'n':
+			    escape = 0;
+			    putchar('\n');
+			    break;
+			case 'r':
+			    escape = 0;
+			    putchar('\r');
+			    break;
+			case 't':
+			    escape = 0;
+			    putchar('\t');
+			    break;
+			case 'v':
+			    escape = 0;
+			    putchar('\v');
+			    break;
+			case '\\':
+			    escape = 0;
+			    putchar('\\');
+			    break;
+			case '0': // This is for octal values.
+			    break;
+			}
+		else if(argv[i][i2] == '\\')
+		    escape++;
+		else
+		    putchar(argv[i][i2]);
+		}
+	    if(i < (argc-1))
+		putchar(' ');
+	    }
+    putchar('\n');
+
+    end:
+    return 0;
+    }

src/echo.c~

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+#include "common.h"
+
+int main(int argc, char **argv)
+    {
+    int i, i2;
+    char escape = 0;
+
+    if(argc > 1)
+	for(i = 1; i < argc; i++)
+	    {
+	    for(i2 = 0; argv[i][i2] != '\0'; i2++)
+		{
+		if(escape)
+		    switch(argv[i][i2])
+			{
+			case 'a':
+			    escape = 0;
+			    putchar('\a');
+			    break;
+			case 'b':
+			    escape = 0;
+			    putchar('\b');
+			    break;
+			case 'c': // Immediately stop echoing.
+			    goto end;
+			case 'f':
+			    escape = 0;
+			    putchar('\f');
+			    break;
+			case 'n':
+			    escape = 0;
+			    putchar('\n');
+			    break;
+			case 'r':
+			    escape = 0;
+			    putchar('\r');
+			    break;
+			case 't':
+			    escape = 0;
+			    putchar('\t');
+			    break;
+			case 'v':
+			    escape = 0;
+			    putchar('\v');
+			    break;
+			case '\\':
+			    escape = 0;
+			    putchar('\\');
+			    break;
+			case '0': // This is for octal values
+			    break;
+			}
+		else if(argv[i][i2] == '\\')
+		    escape++;
+		else
+		    putchar(argv[i][i2]);
+		}
+	    if(i < (argc-1))
+		putchar(' ');
+	    }
+    putchar('\n');
+
+    end:
+    return 0;
+    }