First commit

Makefile

@@ -0,0 +1,2 @@
+all:
+	gcc -g -Wall csv.c test.c -o test

README.md

@@ -0,0 +1,11 @@
+Just a simple C function for parsing CSV.  License: MIT.
+
+--------
+Documentation
+--------
+
+char **parse_csv( const char *line );
+
+Returns a NULL-terminated array of strings encoded in the indicated line of CSV.
+
+Returns NULL if there was insufficient RAM or if the line is not property encoded CSV.

csv.c

@@ -0,0 +1,145 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+void free_csv_line( char **parsed )
+{
+  for ( ; *parsed; parsed++ )
+    free( *parsed );
+
+  free( parsed );
+}
+
+int count_fields( const char *line )
+{
+  const char *ptr;
+  int cnt, fQuote;
+
+  for ( cnt = 1, fQuote = 0, ptr = line; *ptr; ptr++ )
+  {
+    if ( fQuote )
+    {
+      if ( *ptr == '\"' )
+      {
+        if ( ptr[1] == '\"' )
+        {
+          ptr++;
+          continue;
+        }
+        fQuote = 0;
+      }
+      continue;
+    }
+
+    switch( *ptr )
+    {
+      case '\"':
+        fQuote = 1;
+        continue;
+      case ',':
+        cnt++;
+        continue;
+      default:
+        continue;
+    }
+  }
+
+  if ( fQuote )
+    return -1;
+
+  return cnt;
+}
+
+char **parse_csv( const char *line )
+{
+  char **buf, **bptr, *tmp, *tptr;
+  const char *ptr;
+  int fieldcnt, fQuote, len, fEnd;
+
+  fieldcnt = count_fields( line );
+
+  if ( fieldcnt == -1 )
+    return NULL;
+
+  buf = malloc( sizeof(char*) * (fieldcnt+1) );
+
+  if ( !buf )
+    return NULL;
+
+  len = strlen(line);
+
+  tmp = malloc( len+1 );
+
+  if ( !tmp )
+  {
+    free( buf );
+    return NULL;
+  }
+
+  bptr = buf;
+
+  for ( ptr = line, fQuote = 0, *tmp = '\0', tptr = tmp, fEnd = 0; ; ptr++ )
+  {
+    if ( fQuote )
+    {
+      if ( !*ptr )
+        break;
+
+      if ( *ptr == '\"' )
+      {
+        if ( ptr[1] == '\"' )
+        {
+          *tptr++ = '\"';
+          ptr++;
+          continue;
+        }
+        fQuote = 0;
+      }
+      else
+        *tptr++ = *ptr;
+
+      continue;
+    }
+
+    switch( *ptr )
+    {
+      case '\"':
+        fQuote = 1;
+        continue;
+      case '\0':
+        fEnd = 1;
+      case ',':
+        *tptr = '\0';
+        *bptr = strdup( tmp );
+
+        if ( !*bptr )
+        {
+          for ( bptr--; bptr >= buf; bptr-- )
+            free( *bptr );
+
+          free( buf );
+          free( tmp );
+
+          return NULL;
+        }
+
+        bptr++;
+        tptr = tmp;
+
+        if ( fEnd )
+          break;
+        else
+          continue;
+
+      default:
+        *tptr++ = *ptr;
+        continue;
+    }
+
+    if ( fEnd )
+      break;
+  }
+
+  free( tmp );
+  return buf;
+}

csv.h

@@ -0,0 +1 @@
+char **parse_csv( const char *line );

test.c

@@ -0,0 +1,16 @@
+#include <stdio.h>
+
+void free_csv_line( char **parsed );
+char **parse_csv( const char *line );
+
+int main(void)
+{
+  char *test = "a,b,\"c,d\",\"e,f,\"\",g\",h";
+  char **parsed = parse_csv( test );
+  char **ptr;
+
+  for ( ptr = parsed; *ptr; ptr++ )
+    printf( "%s\n", *ptr );
+
+  return 1;
+}