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Add vector utility functions
Signed-off-by: Lars Hjemli <hjemli@gmail.com>
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1
Makefile
1
Makefile
@ -103,6 +103,7 @@ OBJECTS += ui-stats.o
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OBJECTS += ui-summary.o
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OBJECTS += ui-tag.o
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OBJECTS += ui-tree.o
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OBJECTS += vector.o
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ifdef NEEDS_LIBICONV
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EXTLIBS += -liconv
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38
vector.c
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38
vector.c
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@ -0,0 +1,38 @@
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include "vector.h"
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static int grow(struct vector *vec, int gently)
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{
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size_t new_alloc;
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void *new_data;
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new_alloc = vec->alloc * 3 / 2;
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if (!new_alloc)
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new_alloc = 8;
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new_data = realloc(vec->data, new_alloc * vec->size);
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if (!new_data) {
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if (gently)
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return ENOMEM;
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perror("vector.c:grow()");
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exit(1);
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}
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vec->data = new_data;
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vec->alloc = new_alloc;
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return 0;
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}
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int vector_push(struct vector *vec, const void *data, int gently)
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{
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int rc;
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if (vec->count == vec->alloc && (rc = grow(vec, gently)))
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return rc;
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if (data)
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memmove(vec->data + vec->count * vec->size, data, vec->size);
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else
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memset(vec->data + vec->count * vec->size, 0, vec->size);
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vec->count++;
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return 0;
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}
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17
vector.h
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17
vector.h
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@ -0,0 +1,17 @@
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#ifndef CGIT_VECTOR_H
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#define CGIT_VECTOR_H
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#include <stdlib.h>
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struct vector {
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size_t size;
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size_t count;
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size_t alloc;
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void *data;
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};
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#define VECTOR_INIT(type) {sizeof(type), 0, 0, NULL}
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int vector_push(struct vector *vec, const void *data, int gently);
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#endif /* CGIT_VECTOR_H */
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