libds

simple data structures library and utility functions
git clone git://git.2f30.org/libds.git
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commit a7662dfad06c9cc6d930d627829d301d85fefa43
parent dbc5007c9dd9bfabad376d74e55b9f2c65584a64
Author: sin <sin@2f30.org>
Date:   Tue May  6 13:38:22 +0100

Add replace_str()

Diffstat:
Makefile | 2+-
ds.h | 3+++
stack.c | 1-
str.c | 37+++++++++++++++++++++++++++++++++++++
4 files changed, 41 insertions(+), 2 deletions(-)
diff --git a/Makefile b/Makefile @@ -3,7 +3,7 @@ include config.mk -SRC = fifo.c stack.c tokenize.c vector.c +SRC = fifo.c stack.c str.c tokenize.c vector.c OBJ = ${SRC:.c=.o} SOUT = ${NAME}.a diff --git a/ds.h b/ds.h @@ -16,6 +16,9 @@ void *stack_push(struct stack *, void *); void *stack_pop(struct stack *); void *stack_peek(struct stack *); +/* str.c */ +char *replace_str(const char *, const char *, const char *); + /* tokenize.c */ int gettokens(char *, char **, int, char *); int tokenize(char *, char **, int); diff --git a/stack.c b/stack.c @@ -1,4 +1,3 @@ -#include <stdio.h> #include <stdlib.h> struct stacknode { diff --git a/str.c b/str.c @@ -0,0 +1,37 @@ +/* Taken from: http://creativeandcritical.net/str-replace-c/ */ +/* Released in the public domain */ +#include <stddef.h> +#include <stdlib.h> +#include <string.h> + +char * +replace_str(const char *str, const char *old, const char *new) +{ + char *ret, *r; + const char *p, *q; + size_t oldlen = strlen(old); + size_t count, retlen, newlen = strlen(new); + + if (oldlen != newlen) { + for (count = 0, p = str; (q = strstr(p, old)) != NULL; p = q + oldlen) + count++; + /* this is undefined if p - str > PTRDIFF_MAX */ + retlen = p - str + strlen(p) + count * (newlen - oldlen); + } else + retlen = strlen(str); + + if ((ret = malloc(retlen + 1)) == NULL) + return NULL; + + for (r = ret, p = str; (q = strstr(p, old)) != NULL; p = q + oldlen) { + /* this is undefined if q - p > PTRDIFF_MAX */ + ptrdiff_t l = q - p; + memcpy(r, p, l); + r += l; + memcpy(r, new, newlen); + r += newlen; + } + strcpy(r, p); + + return ret; +}